Enterra Energy Trust was founded in 1998 and is headquartered in Calgary, Canada with an additional office is in Carney, Oklahoma. Enterra Energy Trust, an open-end unincorporated investment trust, through its subsidiaries, engages in the exploration for and production of oil and gas in Canada and the United States. Enterra Energy Trust holds interests in various properties, including Clair, Provost-Alliance-Wainwright, Princess, and Ricinus in Alberta; Desan in British Columbia; and Liebenthal in Saskatchewan. Enterra Energy Trust also owns interests in properties located in Grant, Lincoln, and Logan counties in Oklahoma. As of December 31, 2008, Enterra Energy Trust had proved and probable reserves of 26,699 mboe.