fan delta

A fan delta is a landform that forms at the mouth of a river where it flows into a larger body of water, like a lake or sea. It emerges when the river slows down, causing its transported sediment—like silt and sand—to settle out. Over time, these sediments spread outward in a fan or cone shape, creating a gently sloping deposit that resembles a fan. This process results in a delta with multiple channels and rich soils, often supporting diverse ecosystems and human settlements. Fan deltas are common in areas where rivers meet still or slow-moving water bodies.