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40d:Ocean
An ocean is an immense volume of saltwater.
Oceans in Dwarf Fortress
Oceans are inhospitable areas for dwarves, and it is impossible to found a fort solely in an oceanic biome. There are generally a couple oceans on every generated map, they come in three varieties, based on temperature, which have little effect on their workings: Arctic, Temperate and Tropical.
They tend to have a heavy effect on the surrounding geography of the generated world. Volcanoes can often be found around the perimeter of the ocean, and this tends to be easiest place to find them. Marshes and swamps also tend to form around oceanic coastlines, especially near rivers. The land surrounding oceans also tends to have a high water table, resulting in aquifers close to the surface.