They are known to have roamed all over Southeast Asia and into northeast India. Today, they're found in only one place: the 12,600-acre Ujung Kulon National Park in Indonesia.
In fact, due to poaching and habitat loss, they're one of two rhino species in Indonesia on the brink of extinction, as the Sumatran rhino also counts fewer than 100 individuals among its numbers.
The Javan and Sumatran rhinos are among five remaining extant species of rhinoceros in the world after the IUCN declared the western black rhinoceros extinct in 2011. According to the World Wildlife Fund, the last Javan rhino in Vietnam was poached in 2010.