Assertion: park's waterfall | /r/AtLocation | tributary
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Source sentences:
text: Within the park, there are three large waterfalls on the Genesee River and as many as 50 waterfalls found on tributaries that flow into it; the deep gorge formed by the river, with rock walls rising up to 550 feet (170 m) in places and which narrow to 400 feet (120 m) across above the middle of the three falls, prompted the area's reputation as the "Grand Canyon of the East".