What is an area of land drained by a river and its tributaries?

Answer

A basin is a land area that is drained by a river and its tributaries. Alternatively, it can also be called a watershed.
Q&A Related to "What is an area of land drained by a river and..."
Basin.
http://wiki.answers.com/Q/What_is_land_area_draine...
The word basin is a word for rivers, tributaries and land drained.
http://www.chacha.com/question/what-is-a-word-for-...
Watershed. You mis-spelled tributaries, too.
http://answers.yahoo.com/question/index?qid=100601...
It is called a watershed or drainage basin.
http://www.blurtit.com/q4158869.html
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