Ubon Ratchathani is one of the four major cities of Isan (Khorat/Nakhon Ratchasima, Ubon Ratchathani, Udon Thani, and Khon Kaen), also known as the "big four of Isan". The city is on the Mun River in the south-east of the Isan region of Thailand. It is known as Ubon (อุบลฯ) for short. The name means "royal lotus city". The provincial seal features a pond with a lotus flower and leaves in a circular frame. Ubon was the administrative centre of Ubon Ratchathani Province. As of 2006, the Ubon urban area had a population of about 200,000. This included 85,000 in Thetsaban Nakhon Ubon Ratchathani (Ubon municipality), 30,000 each in Thetsaban Mueang Warin Chamrap (Warin municipality) and Thetsaban Tambon Kham Yai, 24,000 in Thetsaban Tambon Saen Suk, 10,000 in each of Thetsaban Tambon Pathum and Tambon Kham Nam Saep, and 6,000 in Thetsaban Tambon Ubon.