Also, the islands of Baja California located in the Gulf of California are part of the municipality, among them the mudflat islands at the mouth of the Colorado River (the largest one being Montague Island), Isla Ángel de la Guarda and the islands of the San Lorenzo Marine Archipelago National Park.
The hamlet also gives its name to Mucking Flats, the mudflat on the estuary to the east of the village, one of Essex's Sites of Special Scientific Interest and once the site of a small lighthouse.