Qatar population was 2.6 million: 313,000 Qatari citizens and 2.3 million expatriates. Islam is the official religion of Qatar. The country has the highest per capita income in the world. Qatar is classified by the UN as a country of very high human development and is widely regarded as the most advanced Arab state for human development. Qatar is a high-income economy, backed by the world's third-largest natural gas reserves and oil reserves. Qatar has been ruled by the House of Thani since Mohammed bin Thani signed a treaty with the British in 1868 that recognised its separate status. Following Ottoman
Udon Thani (Chatuchak market in Bangkok may possibly come a close second in size). Some of the revenue from tourism is related to tourists going to and/or coming from the archaeological site Ban Chiang (forty-seven kilometres from the city). Udon Thani Udon Thani (, ) is one of the four major cities (Khorat, Ubon Ratchathani, Udon Thani, and Khon Kaen) of the Isan region, Thailand, (known as the "big four of Isan"). It is the capital of Udon Thani Province. Udon's geographical location is approximately 560 km from Bangkok. Udon is a major official and commercial center in northern Isan, Thailand, and