Asia is too massive and diverse to conceptualize as a single digestible travel "destination". Even defining the borders of this continent is difficult - from the mountains around the Black Sea in the west, to the snow fields of Siberia in the east, there are more people and cities in Asia than outside of it. Asia's and the world's highest point is Mount Everest, along the border of Tibet (China) and Nepal, which rises to 8,848 m (29,028 feet) above sea level. Its lowest point is the Dead Sea, located at the meeting points of Israel, the Palestinian Territories, and Jordan, whose surface is 400 m (1,312 feet) below sea level. Asia's longest river is the Yangtze, which runs 6,300 km (3,915 miles) through China from all the way from the high Tibetan Plateau to Shanghai. Its largest lake is the 386,400 sq km (149,200 square mile) Caspian Sea, which is surrounded by several Central Asian nations. Asia is bounded by the Pacific Ocean to the east, by Australia to the southeast, and by the Indian Ocean to the south. It is bordered by the Red Sea to the southwest, by Europe and Urals to the west, and by the Arctic Ocean to the north.
Petra is a historical and archaeological city in the Jordanian governorate of Ma'an that is famous for its rock cut architecture and water conduits system. Established sometime around the 6th century BC as the capital city of the Nabataeans, it is a symbol of Jordan as well as its most visited tourist attraction. It lies on the slope of Mount Hor in a basin among the mountains which form the eastern flank of Arabah (Wadi Araba), the large valley running from the Dead Sea to the Gulf of Aqaba. Petra has been a UNESCO World Heritage Site since 1985.
The site remained unknown to the Western world until 1812, when it was introduced by Swiss explorer Johann Ludwig Burckhardt. It was described as "a rose-red city half as old as time" in a Newdigate Prize-winning poem by John William Burgon. UNESCO has described it as "one of the most precious cultural properties of man's cultural heritage." Petra was chosen by the BBC as one of "the 40 places you have to see before you die".