Researchers have released new maps documenting the “Great Nile Migration,” the Earth’s largest-known land mammal migration across South Sudan and Ethiopia.

The maps chart the seasonal movements of two antelope species, the white-eared kob (Kobus kob leucotis) and the tiang (Damaliscus lunatus tiang). Every year, around 5 million white-eared kob and 400,000 tiang migrate across 100,000 square kilometers (38,612 square miles) of South Sudan’s wetlands and Ethiopia’s Gambella National Park.

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