The Crow Stone (London Boundary Stone)

The Crow Stone is an 8-meter tall granite obelisk, dated to 1836 or 1837, that marks the eastern boundary of the City of London's conservancy jurisdiction over the River Thames. It is located in the estuary tidal zone between Southend-on-Sea and Leigh-on-Sea.

The stone is made from a single piece of granite and has a square plan. The exterior features a stepped base and is inscribed with the words "God preserve the city of London," along with the names of visiting Lord Mayors and the dates of their ceremonial visits. Additionally, there is a square copper plate attached later by the Port of London Authority, which explains the history of the stone.