The beach at Mamaia stretches for seven kilometres along the Black Sea coast, separated from Lake Siutghiol on the west side by a strip of land rarely more than a few hundred metres wide. The sand is fine and golden, the sea is generally shallow for a considerable distance from the shore, and the water temperature in summer reaches 25–27°C — warm enough for children to play in all day. The beach is divided into sectors, some private (with sunbeds and umbrellas for hire), some free.
The resort is busiest in July and August when Romanians take their main summer holidays, and the beach fills up considerably. May, June, and September offer the best combination of good weather and manageable crowds. The northern end of the beach, away from the main hotel strip, is quieter and less developed.