Dartmoor National Park

Dartmoor is known for its tors – large hills, topped with outcrops of bedrock, which in granite country such as this are usually rounded boulder-like formations. There are over 160 tors on Dartmoor. They are the focus of an annual event known as the Ten Tors Challenge, when over a thousand people, aged between 14 and 21, walk for distances of 35, 45 or 55 miles (56, 72 or 89 km) over ten tors on many differing routes. While many of the hills of Dartmoor have the word "Tor" in them quite a number do not, however this does not appear to relate to whether there is an outcrop of rock on their summit.