Black River Gorges National Park

Listen first. Before you look at anything, stand still for a moment and listen. Wind moves through the canopy in long, slow waves. Somewhere below, water runs over rock. Then a sharp, high call cuts through the air, and a small falcon may drop past the cliff edge. The air up here is cooler and damper than on the coast. It smells of wet leaves, red earth and, sometimes, the sweet rot of fallen guava.

You are standing in Black River Gorges National Park, in the southwest of Mauritius. Port Louis, the capital, sits on the northwest coast, about an hour's drive away. The two places could hardly feel more different. Port Louis is traffic, markets and harbour cranes. This is the largest protected area on the island, a deep fold of green valleys and ridges. It became a national park in 1994, and it protects much of the native forest that Mauritius still has left.

That last point matters more than it first sounds. Mauritius is a volcanic island, and for millions of years it had no people at all. Its plants and animals developed in isolation. When humans arrived, the lowland forests were cleared for timber, sugar cane and settlement. Today only a small fraction of the original native forest survives across the whole island. A large share of what remains is here, on these steep slopes that were simply too hard to farm.

Look out across the gorge. The shape of the land tells you its story. The upper plateau is wide and wet, often wrapped in cloud. From its edge, the ground falls away sharply into deep valleys cut by rivers. These rivers run west and down toward the coast at Black River. As you descend, the climate changes. The plateau receives far more rain than the dry lowlands near the sea. So a single walk here can pass through quite different kinds of forest.

On the horizon, you may spot a pointed summit. This is Black River Peak, the highest point in Mauritius, at about 828 metres. That is not a great height by world standards. But the island rises steeply from the ocean, so the views feel much larger than the number suggests. On a clear day, from the higher viewpoints, you can see the forest roll down toward the west coast and the bright blue line of the lagoon.

Now for the first surprise. That falcon you may have heard is the Mauritius kestrel, a bird found nowhere else on Earth. In the 1970s, it was close to extinction. Only a handful of wild birds were known to survive. Conservationists bred kestrels in captivity, released them, and protected their nesting sites. The population recovered to the point where visitors can sometimes see them hunting over these cliffs. It became one of the best-known bird rescue stories in the world.

The kestrel was not the only one. The pink pigeon is a soft, rosy bird with a pale head, and it also fell to very low numbers. The echo parakeet, a green parrot also called the Mauritius parakeet, was once among the rarest parrots anywhere. Both have been brought back through patient work by local conservation groups, including the Mauritian Wildlife Foundation. If you see a green parrot here, take a second look. It may be one of the descendants of that effort.

Overhead at dusk, you may also notice large dark shapes with slow wingbeats. These are Mauritian flying foxes, a type of fruit bat. They are native to the island and feed on fruit and flowers. Farmers and fruit growers often see them as pests, and they have been the subject of heated public debate in Mauritius. Here in the park, though, they are part of the native forest. They help to spread seeds as they travel between trees.

Here is the second surprise. Much of the green you see is not native at all. Walk into the forest and you will meet strawberry guava, a shrub from South America with small red fruits. It spreads very fast and crowds out the native trees. Privet and other introduced plants do the same. Crab-eating macaques, deer and wild pigs were also brought to the island by people. Inside fenced conservation areas, teams pull out these plants by hand to give native seedlings room to grow.

The native trees themselves are worth knowing by name. Mauritian ebony has very dark, dense heartwood. In the seventeenth century, Dutch settlers cut ebony heavily and shipped it away, and the forests never fully recovered. Another tree, the tambalacoque, has a famous story attached to it. A popular theory once claimed its seeds could only grow after passing through a dodo. Scientists have since challenged this idea. Still, it is a good reminder that the dodo also lived on this island.

For walkers, the park offers a network of trails. Some are short strolls to a viewpoint. Others are long, steep descents into the gorges that take most of a day. The paths can be muddy and slippery after rain, which is often. Near the park's main entrances, small visitor centres provide maps and advice. Alexandra Falls and the Gorges Viewpoint are easy roadside stops. They give you a good first look before you decide how far to go.

One quiet detail is the light. Up on the plateau, cloud can arrive in minutes. The view across the gorge fades to grey, then opens again as the mist moves on. In the morning, the low sun lights the ridges from the east and leaves the valleys in shadow. Later in the day, the light comes from behind the hills toward the sea. If the view is hidden when you arrive, it is often worth waiting a little.

Before you leave, look once more at the forest edge nearest to you. Notice the different shapes of leaves, glossy and dull, broad and narrow. Some of those plants grow only on this island. Others arrived recently and are still spreading. The park is not a frozen museum of the past. It is a place where people work every day to decide what kind of forest Mauritius will have. Listen again for the kestrel as you walk back.