Previously a deeply branched arm of the sea leading west from the Isefjord, most of it is now reclaimed as agricultural land.
The sandy former sea bed is excellent agricultural land, especially for crops such as carrots and potatoes.
The draining project began in 1873, but it took until 1943 before the lowest elevations were pumped dry.
The town of Fårevejle Stationsby grew up where the railway intersects that main road across the seabed; it serves as the administrative and mercantile center for much of the Lammefjord.
The Lammefjord contains Denmark's lowest dry elevation, at 7.0 metres (23 feet 0 inches) below sea level.