The Javan rhinoceros subspecies, Rhinoceros sondaicus annamiticus, used to reside in Cat Tien National Park in Vietnam, but became extinct in 2011 due to poaching.
The subspecies Rhinoceros sondaicus annamiticus formerly occurred in Vietnam, Laos, Cambodia, eastern Thailand, and the area in and around the Cat Loc part (Dong Nai province) of the Cat Tien National Park in Vietnam. This population dwindled to about 7-15 individuals in 1999 before becoming extinct in 2011.
The last Javan rhino in Vietnam died in 2010. It had been shot and its horn had been removed. The species was officially declared extinct in Vietnam the following year.