Datca is a land-based dive and swimming destination on a protected Turkish peninsula, with one harbor base and real local boat-diving infrastructure. Ucanbalik publishes reefs, walls, bays, islands and an artificial wreck in its operator inventory, while the national tourism authority documents public town beaches and the coves west toward Knidos. A good visit combines checked scuba departures with shore snorkeling at suitable public swimming areas, Old Datca, local food and the ancient city of Knidos. The coast is not a free-access dive park: specific marine, wildlife and submerged-heritage rules apply. Freediving courses and managed depth-line sessions were not independently verified. Expect weather-driven site swaps and check ferry timing, operator authorization and medical contingencies before committing.