Lake Memphremagog stretches for 40 kilometres (25 mi), with a mean depth of 15.5 metres (51 ft) and a deepest point at 107 metres (351 ft).

It was formed by melting glaciers 10,000 years ago, during the last ice-age.

The lake freezes over each winter, often becoming up to a metre (three feet) thick.

While the existence of Memphre and most other lake monsters is treated skeptically by the scientific community, reports of sightings persist, with the last in 2005.

[1] In August 2011, an artistic impression of Memphre was featured on a coloured Canadian quarter.