Grand Marais in Seeland is a region in Switzerland, at the foot of the first range of the Jura Mountains, contained by the three lakes of Morat (Murten), Neuchâtel (Neuenburg) and Bienne (Biel). Prior to major hydrological works, it was a marshland that covered 62.5 km2 (24.1 sq mi). The entire Grand Marais, along with the whole of Seeland, was prone to very severe recurring floods before the correction.