Tortuguero National Park

Listen first. Somewhere above you, a deep, rolling roar moves through the canopy. It sounds like a large animal, or a storm coming in. It is neither. It is a howler monkey, small enough to sit in your lap, calling across the treetops. Under that sound you can hear water lapping against wood, insects buzzing in the heat, and the steady crash of the Caribbean surf just beyond the trees. The air is thick and wet. Welcome to Tortuguero, on the far northeastern coast of Costa Rica.

The name says almost everything. In Spanish, a tortuga is a turtle, and Tortuguero means, roughly, the place of turtles. For generations, sea turtles have come out of the ocean onto this long, dark beach to lay their eggs. Long before the park existed, people here knew the rhythm of their arrival. The turtles came in the warm, rainy months, crawled up the sand at night, dug their nests, and slipped back into the waves before dawn.

Here is the first thing many visitors do not realise. There is no road into Tortuguero. You arrive by boat, along a network of canals and rivers, or by small plane onto a short airstrip. That isolation shaped everything about this place. It kept large-scale development away. It also means the village and the park still feel connected to the water. Boats are the buses here, and the canals are the main streets.

The landscape is a narrow world squeezed between two kinds of water. On one side is the open Caribbean Sea. On the other side is a maze of freshwater lagoons, channels, and flooded forest. Between them runs a thin strip of sand and jungle. This is one of the wettest corners of Costa Rica, and rain can arrive at almost any time of year. The heavy rainfall feeds the canals, the swamp forest, and the dense green walls you see along the banks.

Now for the story that put Tortuguero on the scientific map. In the 1950s, an American biologist named Archie Carr began studying the green turtles that nested on this beach. He wanted to know where they went, how they returned, and why their numbers were falling. His long research here helped start one of the longest-running sea turtle monitoring programmes in the world. The organisation that grew from his work is known today as the Sea Turtle Conservancy, and it still works in Tortuguero.

At that time, the turtles were in serious trouble. Their meat and eggs were valuable, and hunting on the beach was heavy. Carr and his colleagues argued that this beach was one of the most important green turtle nesting sites in the Western Hemisphere. Their work, along with Costa Rican conservationists, led to protection of the area. The national park was created in the 1970s, and over the following decades the green turtle population here showed a strong recovery.

Four species of sea turtle nest on this coast. The green turtle is the most common, and its main nesting season falls roughly in the second half of the year. The leatherback, the largest turtle on Earth, tends to arrive earlier, in the spring. Hawksbill and loggerhead turtles also appear, though in much smaller numbers. If you are here in season, you may join a night walk on the beach. These walks are strictly controlled, and you must go with a certified local guide.

The night tour is quiet and dark on purpose. Bright light confuses the turtles, so flashlights and camera flashes are not allowed. Guides use dim red lights instead. You may wait a long time in the warm darkness, listening to the waves. Then, at a signal, you walk slowly toward a shape on the sand. A female turtle, heavy and slow on land, is digging with her back flippers. She drops her eggs into the hole, one by one, and then covers them carefully.

During the day, the park belongs to the canals. A guided boat trip or a paddle in a canoe or kayak is the best way to see it. Move slowly and watch the edges of the water. Caimans, a smaller relative of the crocodile, often rest in the shallows with only their eyes showing. Herons and kingfishers stand on branches near the bank. Look up for sloths, which can look like a clump of dead leaves high in a tree. Spider monkeys move fast and use their tails like an extra hand.

Here is a second detail that surprises people. Watch the surface of the water for a small lizard running on its back legs. This is the basilisk lizard. When it is frightened, it can sprint across the water for a short distance before it sinks or reaches the other side. Locals sometimes call it the Jesus Christ lizard for exactly this reason. Above the canals, listen for the loud calls of parrots, toucans, and, if you are lucky, the rare great green macaw.

The village of Tortuguero sits at the northern edge of the park, on that same thin strip of land. It is small, with sandy paths instead of paved roads. Houses are painted in bright greens, blues, and yellows, and many stand on short posts above the damp ground. You can hear reggae and calypso from small restaurants, a sign of the strong Afro-Caribbean culture of this coast. Many families here once depended on turtle hunting. Today, many work as guides, boat captains, and hosts.

A few practical notes as you explore. The beach here is beautiful, but it is not a swimming beach. The currents are strong and the waves can be dangerous. Bring a light rain jacket and shoes that can get muddy. Insect repellent is helpful, especially near dusk. If you walk the forest trails, rubber boots are often the most comfortable choice. And remember that this is a protected area. Stay on marked paths, keep your distance from wildlife, and never feed the animals.

Before you leave, take a moment to stand where the sand meets the trees. To your back is the forest, full of sound and movement. In front of you is the long, empty beach, curving away in both directions. Look closely at the sand. In season, you may see wide tracks running from the waterline toward the vegetation, like the marks of a small tractor. Those tracks were made last night, by a turtle that may have swum thousands of kilometres to reach this exact coast.

As you walk back toward the village or the boat dock, listen once more. The howler monkeys may still be calling. The waves will still be breaking. The canals will still be moving slowly toward the sea. This place survived because people decided that the turtles mattered. Somewhere under the sand near your feet, a nest may be warming in the sun... and in a few weeks, small hatchlings will dig their way out and run for the water.