A river delta is a depositional landform created where a river enters a slower-moving or standing body of water, such as a sea, lake, or estuary. The process of formation occurs when the river's velocity rapidly decreases, causing the river to lose its ability to transport its sediment load, which then deposits in characteristic, often fan-shaped, patterns. These deposited materials build up the delta structure, resulting in a complex network of interconnected distributary channels and associated wetlands. Deltas are ecologically vital areas that support high biodiversity and play a critical role in coastal dynamics and sediment cycling. Their morphology is highly dependent on the balance between the river's sediment input, the strength of incoming currents, and the rate of subsidence.