This is one of the Roman Wall Loughs and is managed jointly between Northumberland Wildlife Trust and Northumberland National Park Authority. This National Nature Reserve has a bird hide and boardwalk through the reed beds.
The site contains a mix of habitats beyond the open water of the Lough including carr woodland, bog and grassland. There is a good variety of water plants including 11 species of pondweed and stonewort. Around the margins are areas of reed bed with other plants including bog bean and marsh cinquefoil. The Lough is used extensively by wildfowl and waders that feed in the shallow waters and wetlands.