Alter Aeon Online Help

Keywords are:  'ocean river stream aquatic biomes'

There are several types of aquatic terrain:

stream     - brooks, creeks, shallow rivers
river      - deep natural watercourses or artificial canals
water      - ponds, lakes, springs, anywhere you find open, still water
underwater - beneath the surface of deep water
ocean      - saltwater, typically continental shelves and estuaries
beach      - shorelines of large bodies of waters, usually oceans

These terrains, save streams and beaches, require swimming or magical means
to cross. Foraging in water terrain will yield different results than on
land, as will foraging in saltwater oceans or underground pools. Streams
and rivers are also good places to mine for microcrystalline quartz
minerals such as sard, agate and onyx.

Farther from shore, the ocean grows very deep. Deep ocean water can only
be traversed by ships or high flying constructs such as bone dragons.