Upnor comprises two small villages—Lower Upnor and Upper Upnor—in Medway, Kent, situated on the western bank of the River Medway. The area is noted for its historic Upnor Castle, an Elizabethan artillery fort that once protected the nearby Chatham Dockyard.
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Upnor consists of two small villages, Lower Upnor and Upper Upnor, which lie in the parish of Frindsbury Extra on the western bank of the River Medway in Kent, England. The locality is historically significant for Upnor Castle, an Elizabethan artillery fort constructed between 1559 and 1567 on the orders of Elizabeth I. The fort was built to protect the Chatham Dockyard, a key naval facility, and the Royal Navy ships anchored in the Medway. It features a two‑storeyed main building surrounded by a curtain wall and towers, with a triangular gun platform projecting into the river. During its operational period the garrison numbered about 80 men, with a peak armament of around 20 cannon of various calibres. The village’s setting by the river and its proximity to the historic dockyard give it a distinct maritime character within the Medway district.