drainage basin
area of land where precipitation collects and drains off into a common outlet, such as into a river, bay, or other body of water
en-GB/ˈdɹeɪnɪd͡ʒ ˈbeɪsn/
en-US/ˈdɹeɪnɪd͡ʒ ˈbeɪsən/
area of land where precipitation collects and drains off into a common outlet, such as into a river, bay, or other body of water