Barton Broad is a large lake that forms part of the River Ant which gives its name to a 164-hectare (410-acre) nature reserve north-east of Norwich in Norfolk. The reserve is owned and managed by the Norfolk Wildlife Trust. It is part of the Ant Broads and Marshes Site of Special Scientific Interest and National Nature Reserve, and part of it is in the Ant Marshes Nature Conservation Review site, Grade I. It is part of the Broadland Ramsar site and Special Protection Area, and The Broads Special Area of Conservation.