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