Île Shag is located about 1 km east of the southern part of the Île du Havre aux Maisons? South Dune in the Magdalen Islands archipelago. It is a small island with a flat top, and cliffs that rise from the water?s edge. Vegetation is restricted to short grasses and other herbaceous plants. The cliffs, which are comprised of red sandstone, are irregularly shaped as a result of wind and tidal erosion. The mean annual temperature is 4.4?C, and the wind speed during summer averages about 27 km/h. The maximum tide level is about 1 metre. Access to Île Shag is possible with a small motor boat, but landing is difficult.
Île Shag supports one of the largest colonies of Great Cormorants in Québec. A total of 247 nests was recorded during the last survey, which was completed in 1990. This represents almost 4% of the estimated North American Great Cormorant population. The colony on Île Shag has been in existence for quite some time, with an estimate of at least 200 pairs in 1976, and 40 pairs in 1972. In addition to Great Cormorants, 148 pairs of Black-legged Kittiwakes were also recorded during the surveys completed in 1990. Small numbers of Black Guillemots and Great Black-backed Gulls also nest around the shores of the island.
BirdLife International (2020) Important Bird Areas factsheet: Île Shag. Downloaded from http://www.birdlife.org on 26/10/2020.