Inverted river delta
Most river deltas are formed where a river empties into a larger body of water. In this case, the narrow end of the delta is located at the river, with a wide fan-shaped sedimentation region extending outward into the body of water. In some rare cases, most notably the confluence of the Sacramento and San Joaquin Rivers in California, the delta is located at the waterway's exit from a large, flat valley, yet still inside the valley. The sediment is dropped within the valley and the clear water then exits into a bay or the ocean, so the apex of the delta is at this exit, a configuration said to be inverted from that usually seen.This article is a stub. You can help Wikipedia by expanding it.