High Quality Content by WIKIPEDIA articles! The Bridgewater Triangle refers to an area of about 200 square miles (520 km2) within southeastern Massachusetts in the United States. claimed to be a site of alleged paranormal phenomena, ranging from UFO`s to poltergeists and orbs, balls of fire and other spectral phenomena, various "bigfoot" sightings, giant snakes and "thunderbirds", as well as the mutilation of cattle and other livestock.