Wikipedia
Sewardstone is a hamlet in the civil parish of Waltham Abbey in the Epping Forest district of Essex, England. It is 11.6 miles (18.7 km) north north-east of Charing Cross and is the only area outside Greater London that is in a London postal district, . The area consists of scattered development with large sections of open land. It is centred on the A112 Sewardstone Road, which connects Waltham Abbey and Chingford. The King George V Reservoir and Sewardstone Marsh form the boundary with the London Borough of Enfield to the west. It is connected to Enfield Island Village by a footpath but not by road. A section of woodland forms the boundary with the London Borough of Waltham Forest to the south. To the east lies High Beach.
The world HQ of the Scout movement, Gilwell Park, is at Sewardstone.