The Mar y Sol Pop Festival Social_event ( also referred Name_conferral to as Mar y Sol Festival Social_event or simply Mar y Sol – `` Sea and Sun '' ) was a rock festival Social_event that took place Process_start in Manatí , Puerto Rico , about thirty miles west of San Juan , on April 1–4 , 1972 .

It was held Hold on of countryside adjacent to Los Tubos beach in Manatí on the north shore of the island .