What is the definition of a watershed?

A watershed is defined as an area where all rainfall drains to the same location, typically a river, lake, or ocean. This definition highlights the hydrological connections within a landscape—the way water moves across the land and collects in a common water body. In a watershed, any precipitation that falls within its boundaries will eventually flow to the same point, making it an important concept in understanding water management, environmental science, and the impact of land use on water quality.

The concept of a watershed is crucial for various environmental studies. It indicates how pollutants and other substances can travel with the water, affecting ecosystems and communities downstream. Therefore, this understanding is essential for effective conservation efforts and resource management.

The other definitions presented refer to different concepts. A region defined by ecological features focuses on biomes and habitats rather than water flow. A geographical division related to political boundaries deals with governance and jurisdiction rather than ecosystems. Lastly, a definition based on a specific type of ecosystem emphasizes biodiversity and unique species, which does not address the function of water drainage connected to the watershed concept.