Tottori Sand Dunes.

“The Tottori Sand Dunes (Tottori sakyū) are sand dunes located outside the city centre of Tottori in Tottori Prefecture. At a length of nine miles (14 km) and less than 1.5 miles (2.4 km) wide, it is the largest sand dune in Japan. The sand dunes are part of San’in Kaigan Geopark, which is part of The UNESCO Global Geoparks.”