Big Ambejackmockamus Falls is a stretch of rapids on West Branch Penobscot River in Piscataquis County, Maine, in the Northeastern Highlands region. It lies about 23.4 miles northwest of Millinocket as the crow flies.
The Northeastern Highlands are the mountains of northern New England and the Adirondacks, with spruce-fir on the summits and northern hardwood forest of maple, beech and birch below, and countless lakes and boulder-strewn brooks. Fast mountain streams drop over granite and gneiss ledges in chains of falls and pools. West Branch Penobscot River carries 5 recorded rapids along its course.
There are 11 recorded rapids in Piscataquis County. Big Eddy, is about 2.1 miles away. Cribworks, The, is about 2.3 miles away. Abol Falls, 6 feet high, is about 6.5 miles away.
Big Ambejackmockamus Falls is located at 45.8660° N, 69.0920° W. The listing is based on the World Waterfall Database, one of the sources compiled by the U.S. Geological Survey in its inventory of waterfalls and rapids of the conterminous United States. The creek name is confirmed against the federal Geographic Names Information System. The position was verified on aerial imagery. Details on trails, parking and access have not been documented for this rapid yet.