( ( A watershed ) ( ( is ( ( an area ) ( of ( land ( drained ( by ( ( a waterbody ) ( such ( as ( ( ( a stream ) or ) river ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN watershed)) (VP (VBZ is) (NP (NP (DT an) (NN area)) (PP (IN of) (NP (NP (NN land)) (VP (VBN drained) (PP (IN by) (NP (NP (DT a) (NN waterbody)) (PP (JJ such) (IN as) (NP (NP (DT a) (NN stream)) (CC or) (NP (NN river))))))))))) (. .)))
A watershed is an area of land drained by a waterbody such as a stream or river.
(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)))))))