A tangled 'bay'

Bahía Blanca, or White Bay, is the name given to this many-tendrilled body of water as well as the metro area that sits on it. Technically, it's not a bay but an estuary: a transitional waterway between a river (in this case the Napostá Grande Stream) and its opening to the sea, where saltwater and freshwater mingle to become brackish. The city built on the estuary—just 'Bahía' to its 300,000 or so residents—is one of several Argentine ports on the coast of Buenos Aires Province (which, somewhat misleadingly, doesn't include the national capital Buenos Aires).