Platja del Marjal, Blue Flag beach in Alcanar, Spain.

Platja del Marjal is a semi-urban pebble beach in Alcanar, next to the Cases d'Alcanar settlement. It runs 300 metres between the platja de les Cases d'Alcanar and the platja de l'Estanyet, faces south-east, and is about 35 metres wide, with a moderate slope into the water. The barranc de les Forques flows out here.

The beach originated around old salt marshes and pools thick with reeds. The Passeig del Marjal now occupies most of the former wild zones. In 1994 the beach, together with Platja de les Cases d'Alcanar, received the Blue Flag; the two were later merged under the name Platja del Marjal-Les Cases to obtain more lifeguard services and safety.

Locals often treat Platja del Marjal as separate from the beach of Les Cases d'Alcanar, reserving the latter name for the stretch inside the town centre. To qualify for the Blue Flag, the two were administratively merged as Platja del Marjal-Les Cases, a name used mainly on official signs. The barranc de les Forques reaches the sea here.

Platja del Marjal is oriented south-east and has a moderate slope into the water. It offers a refreshment and ice-cream kiosk, signage, portable toilets and showers. The barranc de les Forques flows into the sea here. Since 1994 it shares the Blue Flag with the neighbouring beach of Les Cases d'Alcanar, and the Catalan Water Agency tests the water weekly during the bathing season.

The beach holds a Blue Flag certification, awarded for water quality and environmental management standards that are checked annually. This recognition indicates that the water meets strict cleanliness and safety criteria.