Zakynthos Marine Park encompasses the marine area of the Bay of Laganas, on the southern shores of the island of Zakynthos, and hosts one of the most important sea turtle nesting beaches in the Mediterranean. The nesting habitat in the bay comprises six discrete beaches: Gerakas, Daphni, Sekania, Kalamaki, E. Laganas and Marathonissi islet, totalling about 5 km (3 mi) in length, of which Sekania is rated amongst the world's highest loggerhead nesting concentrations. Apart from the nesting areas the park encompasses the wetland of Keri Lake and the two small islands of Strofadia, which are located 50 km (31 mi) south from the island of Zakynthos.
The marine park is composed of three marine zones (A, B, C) in the Bay of Laganas, in addition to the strictly protected nesting areas, as well as the terrestrial and peripheral zone. For the protection of the ecosystem, fishing activities are strictly prohibited inside each of the marine zones.