English 'basin' from Old French 'bacin,' from Vulgar Latin '*baccīnum' (a water vessel), possibly of Gaulish origin.
A wide, open container used for washing; a natural or artificial hollow area containing water; the area of land drained by a river.
From Old French 'bacin' (basin, bowl, vessel for washing), from Vulgar Latin *baccīnum (a wide, shallow water vessel), a word of debated origin. Some scholars connect it to Gaulish (Celtic) *bacca (a container for water, a vat), suggesting a pre-Roman origin in the language of Gaul. Others link it to Latin 'bacca' (a berry, a small round object), extending the roundness
The geological term 'basin' (an area of land drained by a river system) is a metaphorical extension of the original bowl meaning — the landscape is shaped like a bowl collecting water. The Amazon Basin, the largest river basin on Earth, covers 7 million square kilometers. German 'Becken' was borrowed from the same