( ( ( ( Watersheds and ) divides ) ( ( All ( of ( the ( land area ) ) ) ) ( ( whose water ) ( drains ( into ( a ( stream system ) ) ) ) ) ) ) ( ( is ( called ( ( the ( system 's ) ) watershed ) ) ) . ) )
(ROOT (S (S (VP (VBZ Watersheds) (CC and) (VBZ divides) (NP (NP (DT All)) (PP (IN of) (NP (DT the) (NN land) (NN area))) (SBAR (WHNP (WP$ whose) (NNS water)) (S (VP (VBZ drains) (PP (IN into) (NP (DT a) (NN stream) (NN system))))))))) (VP (VBZ is) (VP (VBN called) (NP (NP (DT the) (NN system) (POS 's)) (NN watershed)))) (. .)))
Watersheds and divides All of the land area whose water drains into a stream system is called the system's watershed.
(ROOT (S (NP (NP (DT All)) (PP (IN of) (NP (NP (DT the) (NN land)) (VP (VBN drained) (PP (IN by) (NP (DT a) (NN river) (NN system))))))) (VP (VBZ is) (VP (VBN called) (NP (NP (PRP$ its) (NN basin)) (, ,) (CC or) (NP (DT the) (`` ``) (JJ wet) ('' '') (NN term) (NN watershed)))))))