Ölüdeniz (literally Dead Sea, due to its calm waters even during storms; official translation name Blue Lagoon) is a small neighbourhood and beach resort in the Fethiye district of Muğla Province, on the Turquoise Coast of southwestern Turkey, at the conjunction point of the Aegean and Mediterranean seas. It is located 14 km (9 mi) to the south of Fethiye, near Mount Babadağ.
It has a sandy bay at the mouth of Ölüdeniz, on a blue lagoon. The beach itself is a pebble beach. The lagoon is a national nature reserve and construction is strictly prohibited. The seawater of Ölüdeniz is famous for its shades of turquoise and aquamarine, while its beach is an official Blue Flag beach.
Ölüdeniz is also famous for its paragliding opportunities. It is regarded as one of the best places in the world to paraglide due to its unique panoramic views, stable weather conditions, and Mount Babadağ's exceptional height.
Since 2010, an international multiday trail running ultramarathon, called Lycian Way Ultramarathon, is held on the historical Lycian Way. The event runs eastward on a route of around 220–240 km (140–150 mi) from Ölüdeniz to Antalya in six days.
Ölüdeniz offer a variety of diving opportunities with regard to its crystal clear waters and rich underwater caves and fauna. Scuba diving is the most popular underwater activity. Local diving agencies provide courses and required scuba diving licences. Snorkelling is another diving activity and many sites are very suitable for snorkelling.