Some millions of years ago Dundgovi Province was at the bottom of the sea. The sedimentary light-coloured limestone formation is the perfect evidence. The sea dried up long-long ago and since then the ancient seabed structures have been eroded by winds that eventually changed the original forms and colours. The limestone massive has two interesting spots to explore, namely Khevtee Bosoo agui (Lie and Stand Cave) and Del uul (Back Mountain) which boasts the largest Bronze Age drawings found in Central Asia. The best season to visit the White Stupa is May to September.