Tris Boukes means "Three Entrances" and it is a natural harbour in the southwest of the island of Skyros, which is protected by two islands that lie off the coast: Platia and the larger Sarakino (with a beautiful beach in the south).
The islands protect the area from bad weather and high waves and you can enter the bay via three routes. During the First World War the port was used as a mooring place for the hospital boats. The English poet Rupert Brooke died here in 1915 on board a hospital boat and he was buried not far from this place in an olive-tree field.
Nowadays the area is more or less closed because it was taken into use by the Greek navy.