The island measures approx.. 55 km in the length. The broadest place measures approx.. 12, the narrowest approx.. 1.5 km. Kos and Kefalos are connected by a main road, that passes the other villages of Zipari, Pyli and Antimachia. Kardamena is situated on the southeast coast. On the north coastthe popular tourist villages of Tigaki, Marmari, and Mastichari are easily accessible by side streets.
The aegean islands are a geologically relatively recent formation. Therefore they exhibit quite rough landscape, beautiful mountain regions with delightful mountain villages, for example Zia. From Zia risesthe Dikeos mountain. From the 850m peak you have a breathtaking view of the neighbouring islands in clear weather.