( ( A watershed ) ( ( is ( ( all ( the land ) ) ( that ( drains ( into ( ( ( a ( particular stream ) ) or ) river ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN watershed)) (VP (VBZ is) (NP (NP (PDT all) (DT the) (NN land)) (SBAR (WHNP (WDT that)) (S (VP (VBZ drains) (PP (IN into) (NP (NP (DT a) (JJ particular) (NN stream)) (CC or) (NP (NN river))))))))) (. .)))
A watershed is all the land that drains into a particular 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)))))))