Baobabs are strange organisms. They do not produce reliable annual growth rings the way temperate hardwoods do, making precise dating difficult. Estimates for the Big Tree's age -- up to 2,000 years based on girth comparisons and growth ring data from other specimens -- are educated guesses rather than certainties. More recently, researchers have noted the tree's deep incisions and irregular trunk structure, suggesting it may actually be three separate trunks, or even three individual trees, that fused together over centuries. If so, no single trunk is necessarily as ancient as the combined girth implies. This is not unusual for baobabs, which frequently grow in clusters that merge into what appears to be a single massive organism. The question of whether the Big Tree is one entity or a cooperative is less important than what it represents: continuity in a landscape shaped by upheaval.

David Livingstone became the first European to see Victoria Falls in 1855, paddling a mokoro dugout canoe to an island in the Zambezi and naming the cascade after Queen Victoria. The Big Tree grows roughly two kilometres from that landing site, and it is sometimes called Livingstone's Tree, though there is no documented evidence that Livingstone himself noted or visited it. What is certain is that the tree was ancient when Livingstone arrived, and it stood within the landscape he described as producing "scenes so lovely must have been gazed upon by angels in their flight." The tree's proximity to the falls has made it a natural landmark for visitors ever since, a quiet counterpoint to the thundering water nearby.

When the Kariba Dam was completed downstream in 1958, the rising waters of Lake Kariba submerged vast stretches of the Zambezi valley. Operation Noah famously rescued thousands of animals stranded on shrinking islands -- elephants, rhinos, snakes, and antelope ferried to higher ground. But the trees could not be moved. Giant baobabs and other ancient specimens that had grown in the floodplain for centuries were either drowned or bulldozed to prevent them from becoming underwater hazards. The Big Tree, standing on higher ground near the falls, survived by geography. Other baobabs of comparable size elsewhere in Zimbabwe -- the Three Giants in the Save Conservancy, a huge specimen at Nkayi, another in Gonarezhou National Park -- are less famous but may actually be larger. The Big Tree's celebrity owes as much to its location as to its dimensions.

The Big Tree is protected not by Zimbabwe's Parks and Wildlife Management Authority but by the National Museums and Monuments of Zimbabwe, reflecting its status as a cultural heritage site rather than a natural resource. That protection became necessary because visitors, over the years, carved their names into the bark. Baobab bark is soft and forgiving, which made the carving easy and the damage cumulative. A fence now surrounds the tree, keeping human hands at a distance. It is an odd image -- a living thing that has outlasted empires, fenced off from the species most likely to harm it. But the fence works. The bark heals slowly, and the tree continues its imperceptible expansion, adding girth at a rate measured in millimetres per year, indifferent to the tourists who photograph it from behind the barrier.