(1) A relatively low area surrounded by higher land.
(2) An extensive area of depressed land into which streams drain.
(3) Basin and Range: A geological region in the western United States where fault-block mountain ranges separate low-lying, sediment-filled areas. Bounded by the Sierra Nevada mountains in the west, the Columbia Plateau and Snake River Plain in the north, and the Colorado Plateau to the east, this geography extends southward through southern Arizona into northern Mexico.
(4) A round or oval depression in the Earth's surface, often very large, containing the geologically youngest rock in the area at its lowest, central part.
(5) An extensive area of depressed land into which streams drain.
(1) You might also know it as "Amphitheater", "Cirque", "Pit", or "Sink".
(2) When I think of "basin" I think of "large-scale artificial water-holding landscape feature". Or if not that, then I think of "tract of country drained by one river or draining into one sea". And so on. Do you believe that then?
(3) This basin looks depressed. Let's walk there.