Grasslands — also known as prairies, steppes, pampas or savannas — are home to 25% of the world’s population and all kinds of plants and wildlife, including elephants, rhinos and lions.

With its rolling hills, vast open plains and arid deserts, Mongolia’s Eastern Steppe is one of Asia’s last grassland wildernesses. Great migratory herds of Mongolian gazelle roam here along with 5,000 ...