Kosirna successfully combines central pebble and sand sections with wild, rocky edges. The seabed is covered in fine sand, giving the sea a shimmering turquoise color, which is ideal for families with children due to the shallow and gentle entry. The bay is well-protected from the wind, making it a favorite anchorage for yachts and sailboats.

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The entire bay is home to a spacious campsite nestled under pine and olive trees, whose canopies provide natural shade along the rocky parts of the beach. A section of the bay is traditionally reserved for naturists. The beach features charming beach bars and a restaurant with a sea view, as well as a playground for the little ones. Due to its rocky edges and clear water, Kosirna is perfect for snorkeling.