( ( ( Delta - ) ( Triangular ( ( ( ( ( shaped ( sedimentary body ) ) , ) ( up ( to ( thousands ( of ( ( square kilomenters ) ( in area ) ) ) ) ) ) ) , ) ( where ( ( river systems ) ( interact ( with ( lake ( or ( ocean water ) ) ) ) ) ) ) ) ) ) . )
(ROOT (NP (NP (NNP Delta)) (: -) (NP (NP (NNP Triangular)) (VP (VBN shaped) (NP (JJ sedimentary) (NN body)) (, ,) (ADVP (RB up) (PP (TO to) (NP (NP (NNS thousands)) (PP (IN of) (NP (NP (JJ square) (NNS kilomenters)) (PP (IN in) (NP (NN area)))))))) (, ,) (SBAR (WHADVP (WRB where)) (S (NP (NN river) (NNS systems)) (VP (VBP interact) (PP (IN with) (NP (NN lake) (CC or) (NN ocean) (NN water)))))))) (. .)))
Delta- Triangular shaped sedimentary body, up to thousands of square kilomenters in area, where river systems interact with lake or ocean water.
(ROOT (S (NP (NNP Delta)) (VP (VBZ is) (NP (NP (DT a) (NN triangular) (NN feature)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN formed) (SBAR (WHADVP (WRB when)) (S (NP (DT a) (NN river)) (VP (VBZ empties) (PP (IN into) (NP (NP (DT a) (JJ large) (NN body)) (PP (IN of) (NP (RB still) (NN water)))))))))))))) (. .)))