Platja de la Martinenca, Beach in Alcanar, Spain.

Platja de la Martinenca, popularly known as Platja del Ciment, is a triangular, semi-urban beach in Alcanar, 311 metres long and 84 metres wide on average, made of fine and medium golden sand. It faces south-southeast, bordered to the east by the main breakwater of the cement factory's port and to the west by a rocky stretch separating it from Platja del Maricel, with holm oaks and dwarf palms around it.

The beach takes its popular name, platja del Ciment, from the cement factory built directly behind it, which uses limestone quarried from the Serra del Montsià. Its eastern end is closed by the main breakwater of the factory's port, and a stretch of rocks separates it from Platja del Maricel to the west.

Locals call it platja del Ciment after the cement factory that stands right behind the sand, which uses limestone quarried from the Serra del Montsià. The beach is semi-urban and triangular, backed by holm oaks and dwarf palms, and it faces south-southeast.

The beach lies in front of the cement factory, bordered to the east by the factory port's main breakwater and to the west by a rocky stretch separating it from Platja del Maricel. It has a large vehicle parking area, sun lounger, parasol and paddle boat rental, and beach bars. It is far from Alcanar's centre yet often has medium-high occupancy.

Locals call it platja del Ciment because it faces the cement factory, which uses limestone from the Serra del Montsià; the beach is bounded to the east by the factory port's main breakwater and to the west by rocks separating it from platja del Maricel.