Northey Island is an island in the estuary of the River Blackwater, Essex. It is linked to the south bank of the river by a causeway, covered for two hours either side of high tide. The island is approximately 1 mile (2 km) to the east of Maldon, Essex and 1 mile (2 km) to the west of Osea Island.
The Battle of Maldon, 991 is believed to have taken place on the south bank near the island.
In 1923 Northey was bought by Norman Angell.
The whole island and part of the bank near the causeway are now a national nature reserve. It is uninhabited apart from the warden. The island is owned by the National Trust and can be visited by arrangement with the warden. It is one of 43 (unbridged) tidal islands which can be walked to from the British mainland and one of six such tidal islands in Essex.
- No Boat Required – Exploring Tidal Islands, Peter Caton, 2011, Troubador Publishing, ISBN 978-1848767-010
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