What is a wide, deep area of water with slow currents called?

A wide, deep area of water with slow currents is referred to as a pool. In the context of river systems, a pool is characterized by its deeper section compared to the surrounding areas, where water flows more slowly. This environment is important for various aquatic species as it provides a habitat that can support larger organisms, serve as a resting area, and offer breeding grounds.

The nature of pools allows for the accumulation of organic material and sediments, which can promote the growth of plant life and provide shelter for fish and other aquatic organisms. Understanding this habitat is crucial for recognizing the roles different water features play in the ecosystem.