The Bridgewater Triangle is 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 UFOs to poltergeists, orbs, balls of fire and other spectral phenomena, various bigfoot-like sightings, giant snakes and "thunderbirds".

Sources:

The Ghosts of the Bridgewater Triangle by Christopher Balzano (Introduction by Loren Coleman).