Playa de Sancti Petri, Atlantic beach in Chiclana de la Frontera, Spain.

Playa de Sancti Petri is a beach in Chiclana de la Frontera, in the province of Cádiz, within the Parque Natural de la Bahía de Cádiz. A cliff separates it from La Barrosa, the town's other main beach. Offshore stand the castle of Sancti Petri and the Punta del Boquerón, both in San Fernando; behind the beach lie the Sancti Petri marshes and the village of the same name.

The beach lies in Chiclana de la Frontera, separated from La Barrosa by a cliff. Offshore stands the castle of Sancti Petri, where the temple of Melkart or Gaditan Hercules is said to have stood, and the Punta del Boquerón, both in San Fernando. Behind the beach are the Sancti Petri marshes and the village of the same name.

The beach lies beside the marismas de Sancti Petri and the village of the same name, and the castle of Sancti Petri stands offshore in San Fernando. Local tradition places the temple of Melkart, the Gaditan Hercules, at the castle site, a link to the Phoenician and Roman past of the bay.

The beach has showers, restrooms, and lifeguard coverage throughout the season. Dining options are close by at the marina, and rental shops for water sports equipment are within easy walking distance.

From the sand you can see two landmarks that belong to the neighbouring municipality of San Fernando: the castle of Sancti Petri, linked by tradition to the temple of Melkart or Gaditan Hercules, and the Punta del Boquerón. Behind the beach lie the marshes of Sancti Petri and the hamlet of the same name.