The National Marine Park is the first marine park of Greece and the largest protected marine area in Europe (approximately 2,220 square kilometers). Besides the sea area, the park includes the island of Alonissos, 6 smaller islands (Peristera, Kira Panagia, Psathoura, Piperi, Skatzoura and Gioura) and 22 uninhabited islets and rocky outcrops. The Park is the habitat of the protected species of the Mediterranean seal (Monachus Monachus).

A beach that looks like a card postal! Here you will enjoy the magnificent view to the two deserted islands, Dio Adelfia (meaning “Two Brothers” in Greek). The beach is surrounded by gray rocks and covered by white stones and very fine pebbles. It is considered one of the most popular beaches of the island and attracts many young people for the cocktails and entertainment it offers!

A beach with dozens of shades! Kokkinokastro is considered one of the most spectacular beaches of the island because of its deep blue waters, steep cliffs, yellow sand, colorful stones and green pine trees. As you descend to the beach, you can enjoy the view of the huge red cliffs that continue until deep into the sea forming a small cape. Excavations in the area have shown that in ancient times there was a settlement there, which perhaps justifies the second component "kastro" (meaning “castle” in Greek) in the name.

The "little brother" of Megalos Mourtias (Mikros meaning “small” and Megalos meaning “big” in Greek). It is located on the southwest side of the island. It is a beautiful beach with crystal waters that offers peace and tranquility to the visitor.