16 - Tragaia (Halki) – Agios Georgios – Damarionas – Mersinos Spring – Panagia in Spilia – Xerokampos – Apalyros Castle is a 4.7 mile (11,000-step) route located near . This route has an elevation gain of about 574 ft and is rated as medium. Find the best walking trails near you in Pacer App.