The Mexican government has created a large marine reserve around a group of islands home to hundreds of species including rays, whales and sea turtles.
The Revillagigedo Archipelago is a group of volcanic islands off the country’s south-west coast.
With a protection zone of 57,000 square miles (150,000km), it has become the largest ocean reserve in North America.
The move will mean all fishing activity will be banned, and the area will be patrolled by the navy.
It is hoped the move will help populations hit by commercial fishing operations in the area recover.
The park was designated by a decree signed by Mexican President Enrique Pena Nieto. It will also forbid natural resources being extracted from the land or the building of new hotel infrastructure.