Marine biologists call them the "street children" of the Bosphorus Strait. Pods of dolphins live in a narrow, 20-mile-long channel of water running through Istanbul. They swim, play and breed in ...

This week’s Sea-Floor Sunday image* is from the Black Sea side of the Bosphorous Strait and, as always, shows sea floor bathymetry (hot colors are shallower water and cooler colors are deeper ...