Fourteen kilometers long and just 200 meters wide, it is not much to look at on a map. But Tanzania’s first official wildlife corridor may be one of the most important conservation achievements of the year. Camera traps installed along the Nyerere-Udzungwa corridor recorded 529 elephants using the route in its first 15 months of monitoring, along with at least 1,440 mammals in total and 26 species of large and medium-sized mammals. The elephants, it turns out, were just waiting for the door to be opened.
Reconnecting an ancient highway
The corridor stretches across the Kilombero Valley, from Nyerere National Park and the adjoining Magombera Nature Forest Reserve in the east to Udzungwa Mountains National Park in the west. For elephants, it reconnects a seasonal migration route their ancestors walked for centuries. Each day an elephant must consume enormous amounts of forage and water, which means moving between areas as the wet and dry seasons change what is available where. Cut off the route, and you cut off the herd’s ability to survive.
The route was chosen with unusual care. Researchers with the Southern Tanzania Elephant Program, known as STEP, began studying elephant corridors in southern and central Tanzania back in 2006, and a nationwide assessment in 2009 identified 33 of these pathways across the country. For this corridor, discussions with villagers and government officials began in 2018. The final route was selected with input from local communities, and 368 landowners were compensated nearly 2.2 billion Tanzanian shillings, roughly $880,000 at the time, for surrendering parcels of 1,000 to 2,000 square meters. Nobody’s land was simply taken. Conservation worked because people were part of it.
What the cameras saw
In November 2023, STEP and partner organizations including Lion Landscapes installed 59 cameras at roughly 500-meter intervals along the corridor. The images that came back read like a census of the valley’s wildlife: elephants by the hundreds, but also bushbuck, buffalo, servals, honey badgers, Sykes’ monkeys, Harvey’s red duikers, and even Cape clawless otters. George Lohay, an ecologist and head scientist at the Grumeti Fund, explained why connected habitat matters so much: elephants rely on different areas in different seasons and know exactly where resources like mineral-rich salt licks are located. His own doctoral research found genetic similarities between elephants in Tarangire and Ruaha, more than 700 kilometers apart, evidence that these populations were once one big connected group. The corridor is, in a sense, stitching that old family back together.
The corridor is also being rebuilt, not just protected. Villagers and the organization Reforest Africa have planted 100,000 native trees representing 30 species along the route, with another 50,000 planned. Some sections are being planted densely to recreate rainforest; others will stay open. The young trees planted in late 2023 are already rising above head height. And because elephants and farms share the valley, fencing guides the herds into the corridor and away from crops, with a first-of-its-kind electric fencing system designed to cope with seasonal floods. Residents who once had to leave their fields in the afternoon because of elephant movements can now work through the day.
The scale of what is moving through is hard to overstate. Up to 1,000 elephants climb the steep rainforest slopes of the 6,500-foot Udzungwa Mountains, a journey that links the savanna to the forest floor in a single landscape. Trail cameras are not romantic instruments, they are metal boxes strapped to trees, but they have given conservationists something priceless: proof. Funders, governments, and villages can all see the same images and agree on what they mean. In a field where success is notoriously hard to measure, 529 elephants is a number everyone can understand.
A model worth copying
The corridor is supported by conservation organizations across three continents: Italy’s Fondazione Capellino, the U.S.-based Saving Nature, and Denmark’s Hempel Foundation. And this is only the beginning. Tanzania has identified roughly 70 corridors that need similar protection, and the Nyerere-Udzungwa route is the proof of concept. It joins a run of genuine environmental wins this year, from Turkey’s electric car boom to the geothermal breakthrough at Fervo’s Cape Station. The pattern is the same in each case: ambitious goals, patient engineering, and results you can measure.
There are still problems to solve. Elephants have been slow to use an underpass built beneath a busy road, and a petrol station under construction near the route, plus a proposed hotel and bus station, will need careful management so development does not choke the narrow passage. Conservation is never finished. But consider what has happened here: hundreds of families gave up pieces of their land, tens of thousands of trees went into the ground, and a herd of up to 1,000 elephants now has a safe road between savanna and rainforest. The cameras keep clicking. The elephants keep walking. Sometimes the best news is simply that the ancient routes still work.
