Cabo de Gata and Almeria is a land-based Mediterranean dive destination built around local operators, small boats, sheltered coves, Posidonia oceanica meadows, white villages, salt pans, and protected volcanic seascapes. The underwater draw is not coral color but texture: Posidonia oceanica meadows, boulder reefs, shallow caves, octopus, morays, groupers, nudibranchs, barracuda, dentex, seabream, and the historic Vapor Arna wreck. It works best from late spring through autumn, with the warmest water in July to September and quieter value trips in May, June, October, and early November. San Jose, La Isleta del Moro, Las Negras, and Almeria city each make practical bases. The key planning point is conservation: autonomous scuba in protected waters requires prior authorization, operators should handle reserve logistics, anchoring is restricted, and summer beach access to icons like Monsul and Los Genoveses can be quota-controlled.