What type of delta is known for having a triangular shape?

The type of delta that is characterized by a triangular shape is known as an arcuate delta. This structure forms when a river disperses its sediment as it enters a body of water, such as an ocean or a lake. The triangular shape arises from the gentle and even distribution of sediment around the river mouth, creating a fan-like appearance that curves outward.

Arcuate deltas are typically found in areas where the river sediment is deposited in a uniform manner, allowing for a well-defined, curved edge that contrasts with other delta shapes, such as the bird’s foot delta, which has finger-like projections extending into the water. Other deltas may have different characteristics based on the flow of currents, sediment types, and surrounding geography, resulting in less pronounced triangular shapes.