In other cases, other geological processes may have caused only a ring-shaped annular lake to remain from an impact, with a large central island taking up the remaining area of the crater. The world's largest impact crater island (and the world's second-largest lake island of any kind) is René-Levasseur Island, in Lake Manicouagan, Canada. The Sanshan Islands of Lake Tai, China, are also examples of impact crater islands, as are the islands in Canada's Clearwater Lakes, and the Slate Islands of Lake Superior, also in Canada.