Now there's a causeway linking it to Benbecula, the next island, but it's still frontiersville to a townie.
The north east royal road is located approximately 6 km northwest of Prasat Thom, and there is a causeway to Prasat Thom from the royal road.
A more substantial Bronze Age settlement is known to have existed; the remains of what may have been a causeway were discovered in 1934, in the form of wooden piles unearthed by a farmer between Little Thetford and nearby Barway.
The main culprit appears to be a solid causeway, built in 1879, that linked the monastery to the mainland but disrupted the movement of the waters.
Local legend has it that there is a submerged causeway to the island.
The submerged features date from about 7,500 to 10,000 years ago, when the lake's level was much lower and the ridge was a narrow causeway that ran from present-day Michigan to Ontario, dividing the lake in two.
Helen and Gordon also discuss the Dorset Cursus which is a banked causeway that zig-zags across the Chase, over six thousand years old its purpose remains a mystery although it does seem to have some religious significance as it connects some of the surrounding burial grounds.
In 1986, Unesco declared the Giant's Causeway to be a World Heritage Site.
When it does surface from its tunnel, most of what's visible is an elevated causeway.
