A distributary, or a distributary channel,'s a stream that branches off and flows away from a main stream channel. They're a common feature of river deltas. The phenomenon's known as river bifurcation. The opposite of a distributary's a tributary. Distributaries usually occur as a stream nears a lake or the ocean, but they can occur inland as well, such as in an endorheic basin, or when a tributary stream bifurcates as it nears its confluence with a larger stream. In some cases, a minor distrib… (More on Distributary)