Isla Tiburón is the largest island in Mexico and one of the most dramatic landscapes in the Sea of Cortez. Covering about 1,200 square kilometres of rugged Sonoran Desert — mountains, arroyos, dry washes, and coastline — it sits just across the Canal del Infiernillo from Kino Nuevo and is entirely off-limits without a Seri guide and permit.
Access is arranged through Seri contacts in Kino Viejo. The crossing takes about twenty minutes by panga; once on the island you can hike to the interior, look for bighorn sheep and mule deer, and camp on remote beaches with no other visitors in sight. The canal itself is rich with marine life — sea turtles, dolphins, and enormous schools of fish attract pelicans, herons, and ospreys.
This is not a day trip to arrange casually. Bring all your own water, food, and gear. The reward is a place that feels genuinely wild and almost entirely untouched.