The Municipality of Skiathos includes the islets of Tsougria, Tsougriaki, Maragos, Arkos, Troulonisi and Aspronisi. The municipality has an area of 49.898 km2. They are scattered a few kilometres off the southeast coastline and are clearly visible from the town and the beaches. The island of Skopelos is visible from Skiathos with the more distant islands of Euboea and Skyros visible under very clear weather conditions.
The main paved road runs along the southeastern stretch of the island with several narrow dirt roads branching off towards the interior and the northern coast. Farmland exists around the major settlements on the island.
Despite its small size, Skiathos with its many beaches and wooded landscape is a popular tourist destination. It has over 60, mostly sandy, beaches scattered around the 44 km (27 mi) coastline. Some of these are Troulos, Vromolimnos, Koukounaries, Asselinos, Megali Ammos and Mandraki.
Much of the island is wooded with Aleppo Pine and a small Stone Pine forest at the Koukounaries location where there is a lagoon and a popular beach. The island’s forests are concentrated on the southwest and northern parts, but the presence of pine trees is prevalent throughout the island.