- Deltas are formed at the end of rivers (river mouth) as it flows into the sea.
- Rivers carry a lot of sediment (mud).
- The river flows into a calm sea.
- This slows the river down.
- Which makes the river drop its sediment.
- This deposited sediment builds up over years creating a delta.
- The river is forced to split up.
- The smaller rivers made by deltas are called distributaries.
- Examples of Deltas are Nile Delta, Ganges Delta.