bas-, baso-, basi-, ba-, bat-

(Greek > Latin: stepping, to step, to go, to walk; a place where someone steps; a pedestal; a foot for stepping; foundation, ground, base)

river basin (s) (noun), river basins (pl)
An extensive area of land drained by a river and its branches.
An architectural molding at the top of a base, or above the base; such as, a pedestal, podium, or baseboard of the wall.
Difficulty in walking, including excessively fast steps.