This paranormal area was first defined by researcher Loren Coleman in his book Mysterious America. The Triangle encompasses an area of about 200 square miles and includes the towns of Abington, Rehoboth and Freetown at the points of the triangle, and Bridgewater, West Bridgewater, North Middleboro, Segreganset, Dighton, North Dighton, Berkley, Myricks, Raynham, East Taunton, and Taunton inside the triangle. Central to the area is the mysterious Hockomock Swamp, which the Native Americans called "the Devil's swamp."
Paranormal activity in the Triangle include:
- Low-flying UFOs. The first UFO sighted over Bridgewater was in 1760, and was described as a sphere of fire that was so bright it cast shadows in broad daylight. Another was sighted on Halloween night in 1908, appropriately by two undertakers. Dozens more UFOs have been seen in the vicinity from the 1960s through to present day.
- Sightings of Bigfoot. The hairy hominid has been seen many times around Hockomock Swamp. In April, 1970, the creature allegedly picked up the rear of a police squad car, much to the surprise of the two officers inside.
- Thunderbird sightings. Witnesses claim to have seen a giant bird or pterodactyl-like flying creature with a wingspan as great as 12 feet.
- A large phantom dog with red eyes was seen killing two ponies. The witness, the ponies' owner, said the beast ripped their throats and was almost as big as the ponies themselves.
- Assorted strange or out-of-place creatures, including black panthers, giant turtles and snakes as thick as tree trunks.
- Cattle mutilations.
- Indian curses. According to one tale, the Native Americans had cursed the swamp centuries ago because of the poor treatment they received from the Colonial settlers.
- Ghosts. Visitors have experienced such haunting activity as the smell of smoke when there is no fire; a bonfire atop a rock that mysteriously vanished and ghostly voices in Algonquin tongue. There may also be a redheaded phantom hitchhiker who terrorizes motorists on Route 44.
- Spook lights have been seen on a number of occasions.