Olive ridley sea turtles live in tropical and subtropical waters across the Pacific, Atlantic, and Indian Oceans, making them the most widespread of all sea turtle species. They’re found predominantly in the Indo-Pacific region, but their range extends from the warm coastal waters of Mexico and Central America to the shores of West Africa and across to India and Southeast Asia.
Range Across Three Oceans
In the Pacific Ocean, olive ridleys range from northern Mexico to Chile along the eastern coastline, and they also inhabit waters around central Pacific islands. The Atlantic population stretches from as far north as the Azores Islands down to Uruguay, with nesting concentrated along the coasts of West Africa (particularly Suriname, French Guiana, and parts of Brazil on the western side). The Indian Ocean holds arguably the most important population of all, centered around the east coast of India but extending through the waters of Southeast Asia, northern Australia, and the Arabian Sea.
Unlike some sea turtle species that stick close to coastlines, olive ridleys split their time between nearshore and open-ocean environments. They forage in relatively shallow coastal waters but also travel long distances through the open sea, spending much of their non-breeding life in pelagic waters far from shore. This flexibility is part of what makes their range so broad.
Major Nesting Beaches
Olive ridleys are famous for a nesting behavior called an “arribada,” where tens of thousands of females come ashore on the same beach over just a few nights. Only a handful of beaches worldwide host these mass nesting events, and they’re concentrated in three countries.
- Costa Rica: The Pacific coast supports an estimated 600,000 nesting olive ridleys, split between two major arribada beaches at Nancite and Ostional.
- Mexico: La Escobilla, on Mexico’s Pacific coast, hosts roughly 450,000 nesting females.
- India: Three arribada beaches in the state of Odisha (Gahirmatha, Devi River mouth, and Rushikulya) see over 100,000 nests per year. A newer mass nesting site in the Andaman Islands records more than 5,000 nests per season.
Solitary nesting, where individual females come ashore alone rather than in a mass event, happens on beaches across a much wider area, including parts of Central America, northern South America, East Africa, and Southeast Asia. But the arribada beaches account for the vast majority of the global population.
India’s Odisha Coast
The Odisha coast on India’s eastern shore holds a unique position in olive ridley conservation. It’s home to the largest mass nesting sites in the world, accounting for roughly 90% of all sea turtles found along the Indian coast. Some researchers estimate the Odisha rookeries represent close to 50% of the entire global olive ridley population. Gahirmatha, which sits within a designated marine sanctuary, is the single most important nesting beach for the species anywhere on Earth.
Breeding season in Indian waters runs from October to February, when turtles mate in offshore waters before females begin coming ashore. The actual mass nesting events tend to peak between January and March, triggered by environmental cues like wind patterns and temperature changes.
Where They Feed
Between nesting seasons, olive ridleys disperse widely to feed. They’re omnivores that forage on jellyfish, shrimp, crabs, snails, algae, and fish, and they find this food in a range of habitats. Coastal foraging happens over continental shelves, often in waters less than 100 meters deep, where they dive to the seafloor to pick through bottom-dwelling invertebrates. But they also feed in the open ocean, drifting with currents and eating jellyfish and other soft-bodied animals near the surface.
Satellite tracking has shown that their movements between nesting and feeding grounds don’t always follow fixed routes. Some individuals make relatively short trips to feeding areas near their nesting beach, while others travel thousands of kilometers into open water. This nomadic tendency distinguishes them from species like green sea turtles, which tend to commute between the same nesting beach and the same feeding ground year after year.
Conservation Status and Threats
The IUCN classifies olive ridleys as Vulnerable, with a decreasing population trend. Despite being the most abundant sea turtle species, they face serious threats that vary by region. Bycatch in commercial fishing gear, particularly shrimp trawl nets, is the leading cause of death in the Indian Ocean and eastern Pacific. Along the coasts of Central America, egg harvesting (both legal and illegal) reduces the number of hatchlings that make it to the ocean. In India, fishing operations near the Odisha nesting beaches have historically caused mass strandings of adult turtles.
Coastal development threatens nesting beaches in all three ocean basins. Artificial lighting disorients hatchlings, beach erosion from construction reduces available nesting habitat, and vehicle traffic on beaches compacts sand and crushes eggs. Climate change adds another layer of concern: because a sea turtle’s sex is determined by the temperature of the sand during incubation, warming beaches could skew populations heavily toward females over time.
Protective measures have made a measurable difference at several key sites. Turtle excluder devices in fishing nets, beach patrols during nesting season, and marine protected areas like the Gahirmatha Marine Sanctuary have helped stabilize some populations. The recovery of La Escobilla in Mexico, where nesting numbers have rebounded significantly since the 1990s, is one of the clearest success stories in sea turtle conservation.