This vast park bordering Kenya in Northern Tanzania tops our list for one very good reason: the Great Migration. Each year, more than two million wildebeest, zebras and other herbivores move north from the south of the Serengeti towards Kenya, risking life and limb to cross the Mara River in search of food.

It’s the largest mammal migration on Earth, a dusty 500-mile (800km) trek fraught with peril at every turn. Lions hide in the grass, ready to pounce, and – with close to 3,000 crocodiles lying in wait – crossing the Mara River is literally a leap of faith.

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Ranked: The world’s best wildlife destinations