Which extinct volcano in Tanzania is the largest intact volcanic caldera in the world?

Ngorongoro Crater is the world's largest intact volcanic caldera, located in northern Tanzania.

The caldera formed when a large volcano collapsed after a major eruption roughly 2 to 3 million years ago. Its floor covers about 260 square kilometres and is enclosed by steep walls that rise several hundred metres above it. The crater is part of the larger Ngorongoro Conservation Area, which was established in 1959.

The enclosed grasslands, woodland, marshes, and lake support a dense concentration of wildlife, including wildebeest, zebra, gazelles, buffalo, elephants, lions, and spotted hyenas. The crater is not a completely sealed ecosystem: animals move in and out, and seasonal conditions influence where they graze and find water.

Ngorongoro is also important archaeologically. Nearby Olduvai Gorge has produced hominin fossils and stone tools central to the study of human evolution. The conservation area became a UNESCO World Heritage Site in 1979, with its natural and cultural significance recognized together.