What is a watershed?

A watershed is defined as the land area that drains water, sediments, and dissolved materials to a common water body, such as a river, lake, or ocean. This concept is crucial in understanding the hydrological cycle and the interconnectedness of ecosystems. All precipitation that falls within the boundaries of a watershed ultimately flows towards a specific outlet, impacting the water quality and availability for various uses in the region.

The correct answer highlights the importance of recognizing how land use, vegetation, and human activities within a watershed can influence the health of the water body it drains into. Factors such as urban development, agriculture, and natural landscapes can all play significant roles in shaping the watershed's characteristics and the quality of the water flowing through it.