Assertion: delta's edge | /r/HasProperty | the niger
Facets:
Source sentences:
text: A number of types of deltas are classified according to the method of formation and the stages of development: cuspate deltas (the Tiber), bird-foot deltas (the Mississippi), obstructed deltas (the Kamchatka), protruding deltas with an open, rounded seaward edge (the Niger), and multi-island deltas (the Volga).