Islas Coronado

Islas Coronado comprises four uninhabited islands in the Pacific roughly 13 kilometres off Playas de Tijuana, Baja California, Mexico, sitting within Mexican waters just south of the maritime border with the United States. The islands are ringed by kelp forest that shelters a rich cold-water ecosystem, and a resident sea lion colony hauls out on the rocks in numbers large enough to be one of the main draws for both divers and wildlife-watching boats. Visibility improves through the year and is typically best in autumn, reaching around 20 metres in favourable conditions, when divers can see furthest into the kelp canopy and along the rocky reef structure that drops steeply from the shoreline.

Access is exclusively by permitted boat charter, either a dive operation running two-tank trips to the reef and kelp forest or a wildlife-watching trip focused on the sea lions and the seabird colonies that nest on the islands' cliffs; landing on the islands themselves is prohibited specifically to protect those nesting seabirds from disturbance. No scheduled ferry or public transport serves the islands, so a charter must be booked in advance from operators in either Ensenada or San Diego.

A full trip, including the boat transit each way and time in the water or watching wildlife, takes a full day. Divers should be comfortable with cold water and kelp diving conditions, both different from typical warm-water dive destinations further south in Mexico. Because the trip depends entirely on sea conditions and charter schedules, booking with flexibility around weather is worthwhile, and confirming the operator's cancellation policy before paying is a practical precaution given how weather-dependent ocean charters are in this stretch of the Pacific.