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 (Don Mueang International Airport and Suvarnabhumi Airport) with approximately 24 daily flights to the capital by various carriers, Nok Air, Thai Airways, Thai Smile, Air Asia, Bangkok Airways and Lion Air, (2017). By train: Udon Thani Railway Station in the city centre, four trains daily from Bangkok Railway Station (Hua Lamphong) including overnight sleepers. Asia Pacific Resources, a wholly owned subsidiary of Italian-Thai Development PLC, owns the concession to the Udon Thani potash mines and plans to develop them. According to press reports, Udon Thani has enough potash to mine two million tonnes per year for 25 years. Potash is