Lake Massawippi Cliffs is a boat accessible fresh water dive site, located in North Hatley, QC, Canada. The maximum depth is over 150ft/46m.
You are spoiled for choice. The northwest shore of the lake is vertical to over 250 feet. Cliffs cover the entire stretch from Blueberry Point (G), just south of the indicated GPS point (E), to the Cathedral (C) and the wreck of the Mayflower (A).
The A, C, E, G remarks are references in Scubarama’s page.
More details available at Scubarama’s Massawippi page:
in French,
English (Google Translate).