What is the definition of a watershed?

A watershed is defined as an area of land that drains into a specific water body, which means it encompasses all the land, streams, rivers, and lakes that feed into that water body. This definition highlights the crucial role of watersheds in the hydrological cycle, as they collect precipitation and direct the flow of water to rivers, lakes, and sometimes into aquifers. Understanding watersheds is vital for managing water resources, controlling flooding, and protecting ecosystems, as they serve as natural boundaries for water flow.

The other options focus on different environmental concepts: seasonal flooding pertains to specific climatic patterns rather than the drainage process; agricultural zones relate to land use and farming practices; and biodiversity regions emphasize the variety of life and ecosystems, not the hydrological connections that define a watershed.