East Sussex is a ceremonial county in South East England. It is bordered by Kent to the north-east, West Sussex to the west, Surrey to the north-west, and the English Channel to the south. The largest settlement is the city of Brighton and Hove.
The county has an area of 1,792 km (692 sq mi) and had an estimated population of 844,752 in 2024. The largest settlements are located on the coast, and include Brighton and Hove in the south west, Eastbourne in the south, and Hastings in the south east. Away from the coast the county is largely rural, and its major settlements include Crowborough in the north, Halisham in the south-centre, and Lewes in the west. For local government purposes East Sussex comprises a non-metropolitan county, with five districts, and the unitary authority area of Brighton and Hove. East Sussex and West Sussex historically formed a single county, Sussex.