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Grand Marais (German: Grosses Moos) in Seeland ou Pays des trois lacs is a region in Switzerland, at the foot of the first mountain range of the Jura Mountains contained by the three lakes of Morat (Murten), Neuchâtel and Bienne (Biel). Before the huge hydrological works Jura water correction, it was a marshland that covered 62.5 km2 (24.1 sq mi). Before the correction the entire Grand Marais, along with the whole Seeland was prone to very severe recurring floods.
After the Jura water correction, the former marshland has become very valuable agricultural land and made the whole area the most important region in Switzerland for growing vegetables.
The main town and centre of vegetable trading is Müntschemier.
The authorities have established in the area two penitentiaries with surrounding agricultural compounds, where the primary, respectively "light" delinquents quartered there can be productively occupied: Bellechasse (Witzwil) and St. Johannsen.