Perce Rock, in Quebec, Canada, is one of the world’s largest arches over water. An island of limestone in the Gulf of St. Lawrence, the formation measures 1420 feet (433m) in length and over 300 feet (90m) in width. Regarded as both a historical and geological icon, it is aptly named after the pierced hole in its structure.Perce Rock is approximately a 75-minute boat ride from Perce. Trips are restricted to the period from the end of May to the middle of October (exact dates change yearly). Many guided tours are available, which can offer interesting insight into the flora and fauna, geology and fossils on the rock. There is a wonderful legend of Perce Rock.