What is "sardinero"

Sardinero is a popular beach located in the Spanish city of Santander, Cantabria. Sardinero is divided by the gardens of Piquio about one-quarter the way along its length, stretching from the Magdalena Peninsula to Mataleñas; two further adjacent beaches are also sometimes included. Together about 4,300 feet (1,300 meters) long and 260 feet (80 meters) deep, the beach features fine golden sand and moderate waves; it is bordered by a wide promenade running its entire length. Sardinero is lined with hotels, restaurants, and a casino, and is regarded as one of the most elegant beach resorts in Spain.