What typically forms the boundary of a watershed?

What typically forms the boundary of a watershed?

• A. Flat plains
• B. Deep ocean trenches
• C. High land such as mountains or hills
• D. Coastal cliffs

Answer: (C)

The boundary of a watershed is defined by high ground that divides where water drains to different basins. This drainage divide runs along ridgelines or mountain crests, so rain on one side flows into one river system and rain on the other side flows into a different one. That’s why high land such as mountains or hills typically forms the watershed boundary. Flat plains lack a prominent divide to steer water into separate basins, while deep ocean trenches are underwater features and don’t create inland drainage boundaries. Coastal cliffs aren’t the defining factor unless they sit on a ridge that acts as a divide.

The boundary of a watershed is defined by high ground that divides where water drains to different basins. This drainage divide runs along ridgelines or mountain crests, so rain on one side flows into one river system and rain on the other side flows into a different one. That’s why high land such as mountains or hills typically forms the watershed boundary. Flat plains lack a prominent divide to steer water into separate basins, while deep ocean trenches are underwater features and don’t create inland drainage boundaries. Coastal cliffs aren’t the defining factor unless they sit on a ridge that acts as a divide.