It consists of two circles of huge stone blocks. Inside these are two groups of stones in the shape of a horseshoes. No written record exists of the origins of these features and they have always been surrounded by mystery.
A large prehistoric creature is said to be living in the deep waters of the lake, but as yet, in spite of various sightings not scientifically proved to exist. What is the popular name of the monster? What is the name of the lake?