There is no natural body of fresh water on Sark, and very few streams. Although the island is volcanic in origin, the 2000 million year old rocks have been so twisted and heat treated that they are porous, the granite and schists acting as aquifers. The violent geological past results in quartz crystals, including the amethyst Sark stone, which are found occasionally on the beaches. The cliffs mean that there is only one road down to sea level from the plateau 300 feet up, where people live. Sark is famous for its great beauty, its peace and the fact that no cars are allowed on the island.
Transport is by feet, bicycles and, usually for visitors, by horse and carriage.
This is a very short section for Sark. There the post office is found, along with two banks, a jewellers, some caf s and a few other shops. The Anglican Church is near and so is the Medical Centre, where the island's one doctor lives. The Methodist Church is near the west coast of Big Sark. The island has no hospital, no dentist and no vet.