Sawadee.com: Ubon Ratchathani: Travel guide with sections on attractions, festivals and local produce, plus hotel booking.
Ubon Ratchathani: Introduction to the province's history, plus pictures and information on its sights and festivals.
Ubon Ratchathani Province in North-East Thailand: Map of the province, plus brief descriptions of the area's main attractions.
Wikipedia: Ubon Ratchathani: Information on the province's geography, history and administration.