Ocean
Narrowly defined, a large body of saline water on a Gaian Type planet. More generally, extensive bodies of water such as those found beneath the ice of moons or dwarf planets, or liquid layers in the atmospheres of large gas or ice giants, or extensive bodies of other liquid such as the methane-ethane mix on the worlds inhabited by the Muuh or the ammonia-water mix known to the Soft Ones.
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