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Erewash ( ) is a local government district with borough status in Derbyshire, England. The borough is named after the River Erewash. The council has offices in both the borough's towns of Ilkeston and Long Eaton. The borough also includes several villages and surrounding rural areas. Some of the built-up areas in the east of the borough form part of the Nottingham Urban Area.

Erewash Borough has military affiliations with 814 Naval Air Squadron Fleet Air Arm based at Royal Naval Air Station (RNAS) Culdrose and the Mercian Regiment of the British Army, as the successors to the local infantry regiment the Sherwood Foresters.

The neighbouring districts are South Derbyshire, Derby, Amber Valley, Broxtowe, Rushcliffe and North West Leicestershire.