Situated on the ancient Silk Road between Tibet, the Indian subcontinent and Southeast Asia, the Bhutanese state developed a distinct national identity based on Buddhism. The independence of Bhutan has endured for centuries and it has never been colonized in its history. The country's landscape ranges from lush subtropical plains in the south to the sub-alpine Himalayan mountains in the north, where there are peaks in excess of 7,000 metres (23,000 ft). In South Asia, Bhutan ranks first in economic freedom, ease of doing business, and peace and is the least corrupt country as of 2016. Since the 17th century the official name of Bhutan has been Druk yul (country of the Drukpa Lineage, the Dragon People, or the Land of the Thunder Dragon). You can reach Bhutan by air or by road.