Ausable Chasm (ôsāˈbəl) [key], gorge, 2 mi (3.2 km) long, from 20 to 50 ft (6–15 m) wide, from 100 to 200 ft (30–61 m) deep, NE N.Y. The chasm, with its rapids, waterfalls, and curious rock formations, is a popular tourist attraction; Rainbow Falls, 75 ft (23 m) high, is at the southern end of the gorge. The Ausable, a river rising in the Adirondack Mts. and flowing NE to Lake Champlain, continues to carve out the gorge as it passes over the sandstone bedrock.
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