drainage system
pattern formed by the streams, rivers, and lakes in a particular drainage basin
The Three Sisters
watercourse
Glomma basin
drainage basin in Scandinavia
Mississippi River drainage basin
drainage basin of the Mississippi River
Sustainable urban drainage system
designed to reduce the potential impact of development
Class A river system
river classification in Japan
Tana basin
river system in Norway and Finland
Class B river system
river classification in Japan