The island has only one village, the homonymous Kastos, located on its east coast. It has a population of about 80, involved mainly in fishing and tourism services. During the summer Kastioti of the diaspora return for holidays and, together with the fluctuating visitors arriving on yachts, form its seasonal character. The island is 7 km (4 mi) long from north to south, and 800 m wide. The area is 5.901 square kilometres (2.278 sq mi) and its highest point is 142 metres (466 feet) over the Mediterranean Sea level. Kastos has two churches, Agios Ioannis Prodromos, which is located in the centre of the village, and Agios Emilianos, located about 4 km (2 mi) northeastern of the village. Agios Ioannis church is decorated with wall paintings from the notable Eptanesian painter Spyridon Gazis. Also, the island has two windmills and three olive presses, none of them functioning anymore.