MARE PROFUNDUM
The Southern Ocean · The Deep Sea · The Crossing · The Water That Connects Three Worlds
"The open ocean for twenty days is an experience of the world at a scale that most people who live on land never encounter: a horizon that is the same in every direction, no land visible for days at a time, the ship a small and specific thing in an enormous and indifferent expanse. Experienced sailors find this invigorating. First-time passengers find the first week difficult and the second week remarkable and the arrival at Isla Hearthsrest, when the island appears on the horizon, one of the most emotionally vivid experiences of their lives. I found this sequence to be accurate."
The Mare Profundum is not territory in the way that the primary continent's land zones are territory. No one governs it. No people claims it. The Joturvolk work its northern reaches as a hunting ground; the halfling Merchant Council's fleet navigates its established crossing routes; Roman merchant vessels and occasional naval ships follow those same routes under halfling piloting arrangements that the Merchant Council has made carefully indispensable. Beyond the established routes, the ocean is known principally by its absences: the vast stretches of deep water that no ship regularly crosses, the eastern approaches that Merry Burrowfoot has seen something in and has not reported, the southern reaches beyond Neb-Khet where no vessel from the primary continent has successfully gone and returned.
I have crossed the Mare Profundum twice, both times under Merry Burrowfoot's captaincy, at the age of fifty-seven going south and fifty-eight returning north. She was, she informed me on the outbound journey, the oldest first-time southern crossing passenger she had carried. I offered that I would remedy this by crossing again. She noted this would make it worse, not better, as I would then be the oldest two-time crossing passenger. I had not thought of this. She had. I record this exchange because it captures, with accuracy, something essential about the ocean and about Merry: the crossing is something that happens to you, and being prepared for it is not the same as being prepared for it, and she has been navigating this distinction for eighty years.
Geography
The Mare Profundum separates the primary continent from the southern continent (Continens Australis) and lies between the Archipelagus Brindala, the halfling island group approximately three hundred and sixty kilometres south of the Roman coast at Portus Meridiani, and Neb-Khet, Solarhet's northern port on the southern continent's coastal strip. The established crossing runs in two legs: Brindala to Isla Hearthsrest, approximately one thousand five hundred kilometres, taking eight to nine days in good conditions; then Isla Hearthsrest to Neb-Khet, approximately one thousand six hundred kilometres, taking a further nine days. The full crossing from Portus Meridiani to Neb-Khet takes approximately thirty days in good conditions, which is what the Pilot's Guild considers the standard rather than the optimum. The ocean is not reliably fast.
Its extent in the east-west direction is less documented. The primary continent's eastern coast continues south beyond the Campus Magnus's southern reaches, curving away from the established route. The southern continent's eastern extent is unknown to Roman cartography. The ocean between them, the eastern Mare Profundum, is marked on the Pilot's Guild's charts as mare incognitum, which is the accurate designation and which the Guild's chart-makers have maintained without editorial comment for two centuries because the sea that is actually known is complicated enough without speculating about the part that is not.
Isla Hearthsrest sits mid-ocean on the established crossing route, approximately equidistant between the Archipelagus Brindala and Neb-Khet: eight to nine days from Brindala, nine days from Neb-Khet, which is precisely the point at which a ship's water supply and morale benefit from replenishment. The Pilot's Guild has surveyed the island's approaches with the thoroughness that the Guild applies to anything commercially significant. Beyond Isla Hearthsrest in any direction other than the established routes, the Guild's charts become considerably more provisional.
The Archipelagus Brindala marks the northern limit of the open crossing. The four islands are arranged across a roughly northwest-to-southeast axis: Brin-Mere (the largest, site of Brinhaven) and Brin-Haver to the northwest form the northern pair, their proximity framing Brinhaven Bay between them. Brin-Sula and Brin-Thal lie to the southwest, separated from the northern pair by approximately a hundred kilometres of open water. Brin-Mere and Brin-Haver arrived with the Twelfth Permutatio and are geologically foreign to this ocean. Brin-Sula and Brin-Thal are native outcrops, settled by the halflings in the decades after their arrival. Brin-Thal, the most exposed and southernmost, is the last firm ground before the crossing proper begins.
The transposition boundary between the non-native seafloor of the northern islands and the native ocean floor runs in the open water between the two island pairs. Halfling pilots use the compass anomaly at this boundary as a navigation landmark, documented as stable across two centuries of Guild observation, and as reliable in practice as the islands themselves.
Ecosystem
The Mare Profundum's surface ecology, the seabirds, the pelagic fish populations, the migratory patterns of the large marine mammals that the crossings encounter, is documented in the Guild's incident and observation records with the practical specificity of people who care about this primarily when it affects navigation. Flying fish. Schools of large tuna visible at the surface in the outer tropical zone. The whale species whose seasonal migrations cross the established route in the late summer months, generating the observations that the Guild weather-readers incorporate into their seasonal timing recommendations.
What lives below the surface, in the deep ocean, has been addressed by no primary continent scholarship beyond the dwarven archivists' cross-referencing of the giant sagas on deep-sea creatures, which describes something old, in a way that implies the deep northern and the deep southern ocean are connected, and that what the Joturvolk hunt in the northern waters is the surface expression of a deep ecology that extends across the ocean entire. This is speculation on my part, connecting two sources that may not connect. I note it because the connection seems worth attending to, and because the alternative, treating the northern deep-sea creatures and the southern ocean's unknown depths as separate problems, seems, on reflection, like exactly the kind of thinking that would leave a scholar unprepared for what connects them.
Localized Phenomena
The southern crossing is commercially viable because of the halfling weather-reading tradition. The Pilot's Guild's accumulated knowledge of ocean weather patterns, currents, and seasonal variation, carried in their pilots' heads as much as in their charts, representing not two centuries of observation on this world but however many centuries of maritime experience their people brought through the Twelfth Permutatio, means that a Guild-certified weather-reader on a southbound ship can predict, with useful accuracy, the conditions of the next three to five days. This reduces risk to commercially manageable proportions. The southern crossing has been completed over two hundred times in the past century without a vessel lost to weather. This is not the same as without incident, and the Guild's incident records are an extraordinary document of seamanship under sustained pressure.
The Guild does not share its full weather-reading knowledge with non-halfling navigators. This is not secrecy as such: the knowledge is not concealed, simply not published in any form that allows someone to replicate it without the underlying tradition. Roman navigators who have attempted the crossing without Guild piloting have had a significantly different statistical record. The Guild notes this without gloating, which Merry says is the most restrained thing the Merchant Council has ever managed.
Merry Burrowfoot has seen something on the eastern horizon during a crossing she has not formally reported. This is documented in my private notes from a conversation aboard the return crossing. What she saw, and when, and whether she has seen it again, and whether it connects to the giant sagas' entries about the eastern approaches that Hrimthorr has not permitted to be translated: none of these questions have been answered in any source I can cite directly. What I can say is that Merry, who has been at sea for eighty years and whose reported observations are among the most reliable in the known world, does not decline to report things without reason. Whatever she saw, she made a decision about it. That decision has not yet become a communication.
The ocean's deep-water column, below the sunlit surface zone, below the layer that any current diving equipment or technique can reach, is unknown to primary continent scholarship in the same way that the Terra Incognita is unknown: not merely unexplored but actively beyond the capacity of current exploration technology to address. The giant sagas record what the Joturvolk have encountered at the surface of the deep water during eight centuries of northern hunting. The dwarven archivists who have cross-referenced these entries offer the conclusion: something old. The full implication of this conclusion, applied to an ocean that covers more of the world's surface than all its land combined, is something I note without drawing further conclusions, because the conclusions are large and I am eighty-seven years old and prefer to leave some questions for the scholars who come after me.
DM ONLYClimate
The Mare Profundum's climate is not a single climate but a graduated sequence encountered on the crossing. Departing from Portus Meridiani in Provincia Australis, the transition is rapid: the Roman coastal climate gives way within three days to open ocean conditions, stronger swells, more consistent wind, the narrowing of the world to the ship, the water, and the sky. In the first week the weather is variable, influenced by the primary continent's landmass in ways the Guild weather-readers account for and that first-time passengers experience as the crossing's most uncertain phase.
By the second week out of Brindala, the open ocean proper: the prevailing southerlies of the established route, the steady swells that the ships are built to manage and that passengers learn to move with, the heat increasing as the route crosses into tropical latitudes. The Isla Hearthsrest approach brings the first trade wind zone, the consistent easterly that fills the sails reliably and that the Guild's seasonal departure schedule is calibrated around. South of Isla Hearthsrest, the weather character shifts again toward the southern continent's coastal approach, the swell direction changing, the cloud patterns becoming those of a different hemisphere.
The storm season, the period when the established crossing is not attempted by any Guild-certified vessel, runs from early autumn to late winter in the northern hemisphere's calendar. During this period, Hearthsrest is isolated in the commercial sense: ships are present in harbour, work proceeds, the island's resident population manages without the crossing traffic, but no new arrivals arrive and no departing ships leave. I am told that the Night Market during storm season is both emptier and in some ways more itself, the island's permanent residents making use of their island without the crossing traffic's particular energy.
Natural Resources
The ocean's commercially accessible resources are the fishing grounds that the established routes pass through, the trade lane access that the route itself constitutes, and the provisioning stop that Isla Hearthsrest provides. The direct commercial output of the crossing, the Solarhet luxury goods arriving north through Neb-Khet and the Roman manufactured and agricultural goods going south, is the economic foundation of several significant commercial interests on three continents, and the Merchant Council's management of the crossing is the foundation of the halfling Merchant Council's structural indispensability to the primary continent's economy.
The deep-water resources are inaccessible. Whether they are the same as what the Joturvolk harvest in the northern reaches, at enormous personal risk and with purpose-built vessels and eight centuries of accumulated craft knowledge, is a question that no primary continent actor other than the giants is currently positioned to pursue. The giants hunt the north. The south ocean's deep water hunts nothing and is hunted by nothing that has reported back.
History
The Mare Profundum has been present in the world's geography since before any current people arrived: an ocean pre-existing every Permutatio, crossed by no one and known to no one until the Twelfth Permutatio placed the halflings one day's sail south of the primary continent in 1000 A.P. Merry Burrowfoot completed the first commercially successful round-trip crossing thirty years later, naming Isla Hearthsrest on the outbound journey when her crew were eight days out of Brindala and tired and the island appeared on the horizon in the late afternoon.
The southern trade route's establishment at approximately 1030 A.P. opened an economic relationship between the primary and southern continents that has been reshaping the primary continent's luxury economy for one hundred and seventy years. The route is now considered routine by the merchant interests that use it and vital by the economic models that depend on it. Neither of these characterisations fully captures the reality of the crossing, which remains what it was when Merry first made it: an open ocean in two legs, a ship, and the accumulated knowledge of a people who understood from their first generation on this world that the sea was worth engaging with.
For full chronological detail, see: Annales Mundi.
Tourism
The Mare Profundum is crossed by anyone making the southern trade voyage, and the experience, the thirty days at sea across two legs, the arrival at Isla Hearthsrest after the first, the final approach to Neb-Khet after the second, is the most reliably transformative journey available to a primary continent resident who does not have access to the elven forest or the dwarven underground. I recommend it. I also recommend completing it before the age of fifty-seven, and ideally not for the first time at that age under an eighty-year-old captain's amused supervision. Both pieces of advice are offered in the spirit of someone who cannot follow either.
The Guild-certified crossing departs Portus Meridiani on a schedule determined by seasonal weather windows. Passage can be booked through the Merchant Council's Portus Meridiani office, the Brinhaven harbour office on Brin-Mere, or through any halfling trade representative in Nova Romae. The crossing fee includes Guild weather-reading and standard provisioning. Water refill and food resupply at Port Hearthsrest are priced separately. Passengers are advised that Port Hearthsrest's harbour will be more interesting than they expect and the Night Market will require more time than they have allocated, and to plan accordingly.
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