River delta slope offshore, waves will make river deltas smoother. Waves can also be responsible for carrying sediments away from the river delta, causing the delta to retreat. For deltas that form further upriver in an estuary, there are complex yet quantifiable linkages between winds, tides, river discharge, and delta water levels. Erosion is also an important control in tide-dominated deltas, such as the Ganges Delta, which may be mainly submarine, with prominent sandbars and ridges. This tends to produce a "dendritic" structure. Tidal deltas behave differently from a river- and wave-dominated deltas, which tend to have a few main distributaries. Once
Mobile–Tensaw River Delta Mobile–Tensaw River Delta The Mobile–Tensaw River Delta is the largest river delta and wetland in Alabama. It encompasses approximately in a area and is the second largest delta in the Contiguous United States. The delta's northernmost point is the confluence of the Tombigbee and Alabama rivers and follows a southerly direction that ultimately opens into the head of Mobile Bay through the Mobile, Tensaw, Apalachee, Middle, Blakeley, and Spanish rivers near the Battleship Parkway. It is contained within sections of Baldwin, Clarke, Mobile, Monroe, and Washington counties. The Mobile–Tensaw delta is ecologically important and includes a wide variety of habitats,