Which statement best defines a watershed?

A watershed is defined as an area of land that drains into a specific body of water, such as a river, lake, or ocean. This definition is essential for understanding how water flow and the movement of nutrients and contaminants occur within a given geographic area. In a watershed, all precipitation, including rain and snow, flows toward the same endpoint, which can significantly affect the water quality and quantity available in that body of water. This concept is crucial for effective water management and conservation practices, as activities within the watershed, such as agriculture, urban development, and industrial use, can significantly impact the health of the waterways.

The other options do not capture the fundamental aspect of what a watershed is. While they may describe regions used for specific purposes, they do not relate to the hydrological function of the land. Thus, the definition focuses on the hydrological characteristics that clearly delineate a watershed’s role in the ecosystem and the interconnection of water systems.