Lovecraft circle Seal Devil's Reef is an offshore rock formation located in the sea near Innsmouth, Massachusetts.   In 1846, during a sacrificial ritual at the reef, Captain Obed Marsh and several members of the Esoteric Order of Dagon were arrested, though no formal charges were made.

It was destroyed during the government raid of 1928.

Community content is available under CC-BY-SA unless otherwise noted.