The Southern Marshes
Everything is wet. Humidity hangs at ninety percent year-round, coating every surface in a film of moisture that never fully dries. The smell is organic and unavoidable — decomposing vegetation, salt mud, the methane burp of marsh gas escaping clay, and the acrid chemical tang of the evaporation ponds. Sounds travel oddly across flat water and reed beds — voices arrive from unexpected directions, distance collapses and expands. Buildings creak on their pilings with every tide shift. Light is flat and gray, diffused by permanent low fog that rolls in from the remaining open water.
You walk on planks, sleep on pilings, and learn to read the mud — which patches hold weight, which ones swallow boots, and which ones bubble with gas that you don't want to breathe.
Pre-Collapse Identity
Salt evaporation ponds — Cargill's industrial salt works and the Don Edwards Wildlife Refuge, where migrating shorebirds stopped on the Pacific Flyway. Alviso was a forgotten town at the edge of a forgotten bay. Coyote Creek drained the hills into shallow water that nobody swam in. From the air, the salt ponds were geometric art in impossible colors — magenta, ochre, jade — produced by halophilic bacteria thriving in concentrated brine.
Current Character
The transitional zone between the drained bay and the South Sprawl — where people go when even the Dregs push them out. The ground is unstable. Buildings lean on pilings driven into marsh mud that shifts with the tides that still exist in the shallow water to the south. Platform settlements extend across the marshland on improvised stilts, connected by plank walkways that flex underfoot. The old Cargill salt evaporation ponds persist as surreal, rainbow-colored shallow lakes where chemical concentrations have intensified over decades of neglect, producing colors that shouldn't exist in nature and don't — magenta from halophilic archaea, jade from copper leachate, a sulfurous yellow that means don't touch the water.
Terrain & Atmosphere
Shallow marshland, ten to fifteen feet below surrounding terrain. The ground is not ground — it is mud with pretensions, saturated clay that squelches underfoot, accepting pilings grudgingly and shifting them when it feels like it. Salt flat geometry stretches across the landscape in precise rectangles inherited from the industrial salt works. The old evaporation ponds hold shallow chemical water in colors visible from the surrounding hills. Reed beds grow in the transitions between dry and wet, providing cover, building material, and the constant rustling soundtrack of wind through vegetation.
Corporate Presence
Ungoverned. Wholesome sends food distribution outreach from the south — building dependency maps of the marsh population. Relief deploys medical boats into the deeper marsh. Scavenger communities harvest salt, reeds, and whatever the marsh produces. No corporation plants a flag because no corporation wants responsibility for a population living on pilings in the mud. The marsh people are useful precisely because they are uncounted.
Key Locations
The Platform Settlements (improvised stilted communities stretching across the marsh), the Salt Ponds (former Cargill evaporation ponds — chemical rainbow lakes), the Reed Beds (transitional vegetation zone providing cover and materials).
Sub-Sectors
Eight grid squares of sinking ground and rainbow brine, where the map is less reliable than the mud.
The Wetlands
36.1 km²
Reclaimed marshland that is un-reclaiming itself with geological patience. The engineered fill that once supported suburban development is compressing, subsiding, returning to the bay one centimeter per year. Platform settlements now stand where tract homes stood, their pilings driven through the remains of foundations that failed. Relief operates here — medical boats navigating channels between the platforms, humanitarian workers distributing supplies to a population that exists in no corporate census. The water level rises with the tides and doesn't always retreat to the same mark. Every building leans. Every walkway flexes. The residents measure their world in high-water marks painted on pilings. The Low Crossing spans the wetlands at the sub-sector's narrowest point, its bridge deck sagging but passable, connecting The Northern Route and The Corridor to the eastern shore. The Great Rift's seismic trace runs beneath the marsh, its tremors sending ripples across standing water that the residents have learned to read.
Locations
- Relief HQ — Rothwell subsidiary. Humanitarian front operations in the Corridor.
Landmarks
- The Wetlands — Reclaimed marshland sinking back into the marsh.
- The Low Crossing — Southern east-west crossing over the bay floor. Ironclad checkpoint.
- The Corridor — Primary surface transit route through the Peninsula and Silicon Corridor.
- The Northern Route — North-south surface artery running from the Perimeter to the Peninsula.
- +1 more
Factions
The Reserve
26.4 km²
The reservoir — a protected freshwater supply that Ironclad guards with the intensity other corporations reserve for data centers. The dam and its surrounding watershed are fenced, patrolled, and monitored by sensors that detect chemical contamination, biological intrusion, and unauthorized human presence with equal alarm. Clean water is the Sprawl's scarcest resource, and whoever controls the Reserve controls a leverage point that transcends corporate politics. The surrounding hills are green, quiet, and forbidden — a pocket of pre-Cascade wilderness preserved not by environmental concern but by strategic value. The Longline runs along the Reserve's western edge, and The Great Rift's fault trace is visible in the exposed hillside where the reservoir's drainage has stripped the topsoil.
Landmarks
- The Reserve — Protected water supply — the most valuable resource in the Corridor.
Factions
The Salt Geometry
40.1 km²
Salt flat geometry — the old evaporation ponds persist as precise rectangles of chemical brine in impossible colors. Magenta, jade, sulfurous yellow. Harvesting crews extract industrial salt and try not to touch the water with bare skin.
Landmarks
- The Great Rift — Major seismic fault running through multiple sectors.
Factions
The Creek Channels
33.0 km²
The creek channels — shallow waterways threading through reed beds, used by small boats for transit between platform settlements. The current is tidal, unreliable, and carries debris from upstream that nobody claims.
Landmarks
- The Low Crossing — Southern east-west crossing over the bay floor. Ironclad checkpoint.
Factions
The Dry Shelf
38.6 km²
Western hillside above the marsh, where the ground is solid enough for permanent structures but too exposed for comfort.
Landmarks
- The Narrows — Narrowest crossing point on the southern bay floor.
Factions
The Wild Marsh
34.4 km²
Open marshland, uninhabited except by birds and the things that eat birds.
The Last Platform
28.4 km²
Southern marsh edge, where the shallow water deepens and the platform settlements end.
The Drying Strip
23.8 km²
Northern transition strip between the marshland and the industrial sectors, the ground drying by degrees.