Is an estuary a watershed

An estuary is not a watershed, but they are related concepts. A watershed, or drainage basin, is an area of land where all the water drains into a common outlet, such as a river or lake. In contrast, an estuary is a coastal area where freshwater from rivers meets and mixes with saltwater from the ocean, typically serving as a transition zone between land and sea. While watersheds contribute freshwater to estuaries, they represent different environmental features.