Before revision: Explanation 225px|A picture of California's Sacramento-San Joaquin River Delta, with Suisun Bay at left-center and the Carquinez Strait at far left In a typical river delta, the narrow end of the delta is located at the point where a river enters a delta, with a wide fan-shaped sedimentation region extending outward into the body of water into which the river empties.
After revision: Explanation 225px|A picture of California's Sacramento-San Joaquin River Delta, with Suisun Bay at left-center and the Carquinez Strait at far left River deltas typically form on flat, coastal floodplains; the narrow end of the delta is located at the point where a river fans out and deposits sediment in a region extending outward the body of water into which the river empties.