Tanzania's third largest national park, it lies in the remote southwest of the country, within a truncated arm of the Rift Valley that terminates in the shallow, brooding expanse of Lake Rukwa.

The bulk of Katavi supports a hypnotically featureless cover of tangled brachystegia woodland, home to substantial but elusive populations of the localised eland, sable and roan antelopes. But the main focus for game viewing within the park is the Katuma River and associated floodplains such as the seasonal Lakes Katavi and Chada. During the rainy season, these lush, marshy lakes are a haven for myriad waterbirds, and they also support Tanzania’s densest concentrations of hippo and crocodile.

It is during the dry season, when the floodwaters retreat, that Katavi truly comes into its own. The Katuma, reduced to a shallow, muddy trickle, forms the only source of drinking water for miles around, and the flanking floodplains support game concentrations that defy belief. An estimated 4,000 elephants might converge on the area, together with several herds of 1,000-plus buffalo, while an abundance of giraffe, zebra, impala and reedbuck provide easy pickings for the numerous lion prides and spotted hyena clans whose territories converge on the floodplains.

Katavi’s most singular wildlife spectacle is provided by its hippos. Towards the end of the dry season, up to 200 individuals might flop together in any riverine pool of sufficient depth. And as more hippos gather in one place, so does male rivalry heat up – bloody territorial fights are an everyday occurrence, with the vanquished male forced to lurk hapless on the open plains until it gathers sufficient confidence to mount another challenge.

About Katavi National Park
Size: 4,471 sq km (1,727 sq miles).
Location; Southwest Tanzania, east of Lake Tanganyika.
The headquarters at Sitalike lie 40km (25 miles) south of Mpanda town.

Getting there
Charter flights from Dar or Arusha.
A tough but spectacular day's drive from Mbeya (550 km/340 miles), or in the dry season only from Kigoma (390 km/240 miles).
It is possible to reach Mpanda by rail from Dar via Tabora, then to catch public transport to Sitalike, where game drives can be arranged. If travelling overland, allow plenty of time to get there and back.

What to do
Walking, driving and camping safaris.
Near Lake Katavi, visit the tamarind tree inhabited by the spirit of the legendary hunter Katabi (for whom the park is named) - offerings are still left here by locals seeking the spirit’s blessing.

When to go
The dry season (May-October).
Roads within the park are often flooded during the rainy season but may be passable from mid-December to February.

Accommodation
Two seasonal luxury tented camps overlooking Lake Chada. A resthouse at Sitalike and campsites inside the park. Basic but clean hotels at Mpanda.

Silky white coves hem in the azure waters of Lake Tanganyika, overshadowed by a chain of wild, jungle-draped peaks towering almost 2km above the shore: the remote and mysterious Mahale Mountains.

Mahale Mountains is home to some of Africa’s last remaining wild chimpanzees: a population of roughly 800 (only 60 individuals forming what is known as "M group"), habituated to human visitors by a Japanese research project founded in the 1960s. Tracking the chimps of Mahale is a magical experience. The guide's eyes pick out last night's nests - shadowy clumps high in a gallery of trees crowding the sky. Scraps of half-eaten fruit and fresh dung become valuable clues, leading deeper into the forest. Butterflies flit in the dappled sunlight.

Then suddenly you are in their midst: preening each other's glossy coats in concentrated huddles, squabbling noisily, or bounding into the trees to swing effortlessly between the vines.

The area is also known as Nkungwe, after the park's largest mountain, held sacred by the local Tongwe people, and at 2,460 metres (8,069 ft) the highest of the six prominent points that make up the Mahale Range.

And while chimpanzees are the star attraction, the slopes support a diverse forest fauna, including readily observed troops of red colobus, red-tailed and blue monkeys, and a kaleidoscopic array of colourful forest birds.

You can trace the Tongwe people's ancient pilgrimage to the mountain spirits, hiking through the montane rainforest belt – home to an endemic race of Angola colobus monkey - to high grassy ridges chequered with alpine bamboo. Then bathe in the impossibly clear waters of the world’s longest, second-deepest and least-polluted freshwater lake – harbouring an estimated 1,000 fish species - before returning as you came, by boat.

About Mahale Mountains National Park
Size: 1,613 sq km (623 sq miles).
Location: Western Tanzania, bordering Lake Tanganyika.

Getting there
Charter flight from Arusha, Dar or Kigoma.
Charter private or national park motorboat from Kigoma, three to four hours.
Weekly steamer from Kigoma, seven hours, then hire a local fishing boat or arrange with park HQ for pickup in park boat, another one or two hours.

What to do
Chimp tracking (allow two days); hiking; camping safaris; snorkelling; fish for your dinner.

When to go
Dry season (May-October) best for forest walks although no problem in the light rains of October/November.

Accommodation
Three seasonal luxury tented camps.
Two small resthouses, large campsite.