Habitat 67 is Canada's best-known river wave, a natural feature on the St. Lawrence in Montreal where fast current breaking over submerged boulders stacks up a face that can run close to 6 feet. Olympic kayaker Corran Addison was the first to surf it back in 2002, and what started with a handful of paddlers has grown into a scene of roughly 500 regular surfers today. It sits right next to the Habitat 67 housing complex, so expect spectators, and flows somewhere around 7,000 to 7,900 m³/s tend to produce the best shape. This wave gets big and powerful fast, so come with solid swimming and self-rescue skills before paddling out.