The shape of Astypálea is often compared to a butterfly, in that it consists of two separate “wings” joined by a low narrow isthmus. The only major population centre, made up of the built-up strip that joins the waterfront villages of Péra Yialós and Livádhia by way of hilltop Hóra, is on the southeast coast of its western half, well away from both the ferry port and the airport.