Arusha National Park

Listen first. Somewhere above you, in the canopy, a branch shakes. A long white tail swings down from the leaves, then vanishes again. The air under these trees is cool and damp, and it smells of wet bark and moss. Through a gap in the forest, a great dark mountain fills the sky. This is Arusha National Park, and it does not feel like the open, dusty Africa of the postcards. It feels green, close and alive.

The park is small by Tanzanian standards. Many travellers pass it on the road to bigger reserves, and they miss something rare. In a single day here, you can move from swamp to montane forest, from alkaline lakes to the slopes of a volcano. Few parks in East Africa pack so many different landscapes into such a short drive. That is the quiet surprise of this place. Its size is part of its charm.

The mountain above you is Mount Meru. It rises more than 4,500 metres, and it is usually described as the second-highest peak in Tanzania. Only Kilimanjaro, to the east, stands taller. Meru is a volcano, and its summit crater has a broken, horseshoe shape. Long ago, a huge collapse tore away its eastern wall. On a clear morning, you can see the jagged rim and the ash cone that has grown inside it.

Meru is not fully asleep. Geologists record a small eruption in the early twentieth century, and the ash cone is the youngest part of the mountain. The lower slopes, though, look gentle and soft. Rain from the Indian Ocean side feeds dense forest here, full of tall trees draped with grey lichen. Locals sometimes call this lichen old man's beard. It hangs from the branches like long threads of wool, and it grows best in very clean, moist air.

Now, back to that white tail in the canopy. It most likely belongs to a black-and-white colobus monkey, one of the park's best-known residents. Colobus monkeys have long black fur, a white mantle along their sides and a white plume of a tail. They spend most of their lives high in the trees, eating leaves. Unlike many monkeys, they have only a tiny stump where a thumb should be. Watch them leap. Their fur spreads out like a cape.

The history of the park as a protected area is fairly recent. It began in 1960 as a smaller reserve centred on Ngurdoto Crater. A few years later, the lower slopes of Meru and the Momella Lakes were added, and the park took the name Arusha. So the borders you are travelling through today grew in stages. Each stage protected a different piece of this mixed landscape, from crater forest to open water.

Ngurdoto Crater is worth a slow look. It is a wide, bowl-shaped basin, and its walls are covered in forest. Some guides call it a little Ngorongoro, after the much larger crater to the west. But there is one important difference. Vehicles and visitors do not go down into Ngurdoto. The crater floor is left to the animals. You watch from viewpoints on the rim, and with binoculars you may see buffalo grazing far below, like small dark stones in the grass.

To the north lie the Momella Lakes. These are shallow lakes, and several of them are alkaline, which means the water is rich in natural salts. Each lake has a slightly different colour, depending on its minerals and the algae living in it. Some days the water looks green, other days almost turquoise. In the right season, pink flamingos gather along the shallows. They feed with their heads upside down, filtering tiny organisms from the water.

Here is a story from a very different world. In the early 1960s, a Hollywood film crew came to this area to shoot a movie called Hatari, starring John Wayne. Hatari is a Swahili word meaning danger. The film followed a team catching wild animals across the plains, and much of it was filmed around Momella. For a time, a nearby farm became linked with the film's cast. It is strange to imagine cameras and movie stars among these quiet lakes.

The animals here are a little different from the classic safari list. Giraffes are common, and they often walk right beside the track. You may also see zebra, buffalo, warthogs and small antelopes such as bushbuck and dik-dik. A dik-dik is tiny, about the size of a small dog, with big dark eyes. What you are less likely to see are lions. The park is famous for having very few large predators, which changes how the place feels.

That absence makes something special possible here. Arusha is one of the parks where walking safaris are allowed, always with an armed ranger. On foot, everything slows down. You notice dung beetles, animal tracks in the mud, the snap of a twig. Some visitors also paddle canoes on one of the Momella Lakes, gliding past water birds. And for climbers, the trail up Meru begins inside the park, with rangers walking beside every group.

On the forest road, keep an eye out for a giant fig tree. Over many years, a strangler fig wrapped itself around another tree and grew a wide archway. Vehicles can sometimes pass right under it. Strangler figs start life high on a host tree. Their roots grow down to the ground and slowly surround the trunk. It is a slow battle, fought over decades, and here it has made a gate in the forest.

So take a moment before you move on. Look up toward Meru, and notice how quickly the clouds gather around its summit. On a clear day, turn east and search the horizon for the white top of Kilimanjaro. Listen for the colobus in the branches, the call of birds over the lakes, the soft crunch of the track under the wheels. This park asks you to look closely. The small details are the reward.