Bird Island (Isla San Jorge) – Puerto Peñasco

Site Overview

Bird Island, officially Isla San Jorge, is Puerto Peñasco's premier dive site featuring a large California sea lion colony, occasional whale shark visits, and diverse macro life in the sandy patches surrounding the rocky island that make it an accessible and rewarding diving experience in the upper Gulf of California. The island's position at the northern edge of the Sea of Cortez creates a unique marine environment where cold northern Gulf waters mix with warmer southern currents, supporting a diverse mix of temperate and tropical species that is unmatched elsewhere in the region. The sea lion colony numbers approximately 300 individuals with juveniles and adults regularly interacting with divers through playful approaches, bubble-ring blowing, and curious investigation that creates memorable underwater moments. During the late summer and autumn months, whale sharks occasionally pass through the nutrient-rich waters near the island, providing exciting surface encounters for alert divers and snorkelers. The sandy patches surrounding the rocky island host diverse macro life including stingrays buried in the substrate, nudibranchs on rocky outcrops, and various flatfish species that reward patient observation. The relatively shallow depth profile and mild currents make Bird Island accessible for divers of all levels, though the variable visibility characteristic of the upper Gulf requires comfort with less-than-Caribbean clarity. Despite the challenging visibility, the abundance of marine life and guaranteed sea lion encounters make Bird Island the most popular dive destination accessible from Puerto Peñasco, also known as Rocky Point, a favourite weekend destination for visitors from Arizona and Sonora.