The Sumatran rhinoceros lives in both lowland and highland secondary rainforest, swamps, and cloud forests.
It inhabits hilly areas close to water, particularly steep upper valleys with copious undergrowth.
The Sumatran rhinoceros once inhabited a continuous range as far north as Burma, eastern India, and Bangladesh.
Unconfirmed reports also placed it in Cambodia, Laos, and Vietnam.
All known living animals occur in the island of Sumatra.
Some conservationists hope Sumatran rhinos may still survive in Burma, though it is considered unlikely.
Political turmoil in Burma has prevented any assessment or study of possible survivors.
The last reports of stray animals from Indian limits were in the 1990s.

The Sumatran rhino is widely scattered across its range, much more so than the other Asian rhinos, which has made it difficult for conservationists to protect members of the species effectively.
Only four areas are known to contain Sumatran rhinoceros: Bukit Barisan Selatan National Park, Gunung Leuser National Park, and Way Kambas National Park on Sumatra; and on Indonesian Borneo west of Samarindah.

The Kerinci Seblat National Park, Sumatra's largest, was estimated to contain a population of around 500 rhinos in the 1980s, but due to poaching, this population is now considered extinct.
The survival of any animals in Peninsular Malaysia is extremely unlikely.

Genetic analysis of Sumatran rhino populations has identified three distinct genetic lineages.
The channel between Sumatra and Malaysia was not as significant a barrier for the rhinos as the Barisan Mountains along the length of Sumatra, for rhinos in eastern Sumatra and Peninsular Malaysia are more closely related than the rhinos on the other side of the mountains in western Sumatra.
In fact, the eastern Sumatra and Malaysia rhinos show so little genetic variance, the populations were likely not separate during the Pleistocene, when sea levels were much lower and Sumatra formed part of the mainland.
Both populations of Sumatra and Malaysia, however, are close enough genetically that interbreeding would not be problematic.
The rhinos of Borneo are sufficiently distinct that conservation geneticists have advised against crossing their lineages with the other populations.
Conservation geneticists have recently begun to study the diversity of the gene pool within these populations by identifying microsatellite loci.
The results of initial testing found levels of variability within Sumatran rhino populations comparable to those in the population of the less endangered African rhinos, but the genetic diversity of Sumatran rhinos is an area of continuing study.

Although the rhino had been thought to be extinct in Kalimantan since the 1990s, in March 2013 World Wildlife Fund (WWF) announced that the team when monitoring orangutan activity found in West Kutai Regency, East Kalimantan, several fresh rhino foot trails, mud holes, traces of rhino-rubbed trees, traces of rhino horns on the walls of mud holes, and rhino bites on small branches.
The team also identified that rhinos ate more than 30 species of plants.
On 2 October 2013, video images made with camera traps showing the Sumatran rhino in Kutai Barat, Kalimantan, were released by the World Wildlife Fund.
Experts assume the videos show two different animals, but aren't quite certain.
According to the Indonesia's Minister of Forestry, Zulkifli Hasan called the video evidence "very important" and mentioned Indonesia's "target of rhino population growth by three percent per year".
On 22 March 2016 it was announced by the WWF that a live Sumatran Rhino was found in Kalimantan; it was the first contact in over 40 years.
The rhino, a female, is being transported to a nearby sanctuary.

Iman, the last known Sumatran rhino in Peninsular Malaysia, died in November 2019; stem cell technology is being used in an attempt to revitalize the rhino's population and reverse extinction in the country.
The Sumatran rhinoceros lives in both lowland and highland secondary rainforest, swamps, and cloud forests. It inhabits hilly areas close to water, particularly steep upper valleys with copious undergrowth. The Sumatran rhinoceros once inhabited a continuous range as far north as Burma, eastern India, and Bangladesh. Unconfirmed reports also placed it in Cambodia, Laos, and Vietnam. All known living animals occur in the island of Sumatra. Some conservationists hope Sumatran rhinos may still survive in Burma, though it is considered unlikely. Political turmoil in Burma has prevented any assessment or study of possible survivors. The last reports of stray animals from Indian limits were in the 1990s.
The Sumatran rhino is widely scattered across its range, much more so than the other Asian rhinos, which has made it difficult for conservationists to protect members of the species effectively. Only four areas are known to contain Sumatran rhinoceros: Bukit Barisan Selatan National Park, Gunung Leuser National Park, and Way Kambas National Park on Sumatra; and on Indonesian Borneo west of Samarindah.
The Kerinci Seblat National Park, Sumatra's largest, was estimated to contain a population of around 500 rhinos in the 1980s, but due to poaching, this population is now considered extinct. The survival of any animals in Peninsular Malaysia is extremely unlikely.
Genetic analysis of Sumatran rhino populations has identified three distinct genetic lineages. The channel between Sumatra and Malaysia was not as significant a barrier for the rhinos as the Barisan Mountains along the length of Sumatra, for rhinos in eastern Sumatra and Peninsular Malaysia are more closely related than the rhinos on the other side of the mountains in western Sumatra. In fact, the eastern Sumatra and Malaysia rhinos show so little genetic variance, the populations were likely not separate during the Pleistocene, when sea levels were much lower and Sumatra formed part of the mainland. Both populations of Sumatra and Malaysia, however, are close enough genetically that interbreeding would not be problematic. The rhinos of Borneo are sufficiently distinct that conservation geneticists have advised against crossing their lineages with the other populations. Conservation geneticists have recently begun to study the diversity of the gene pool within these populations by identifying microsatellite loci. The results of initial testing found levels of variability within Sumatran rhino populations comparable to those in the population of the less endangered African rhinos, but the genetic diversity of Sumatran rhinos is an area of continuing study.
Although the rhino had been thought to be extinct in Kalimantan since the 1990s, in March 2013 World Wildlife Fund (WWF) announced that the team when monitoring orangutan activity found in West Kutai Regency, East Kalimantan, several fresh rhino foot trails, mud holes, traces of rhino-rubbed trees, traces of rhino horns on the walls of mud holes, and rhino bites on small branches. The team also identified that rhinos ate more than 30 species of plants. On 2 October 2013, video images made with camera traps showing the Sumatran rhino in Kutai Barat, Kalimantan, were released by the World Wildlife Fund. Experts assume the videos show two different animals, but aren't quite certain. According to the Indonesia's Minister of Forestry, Zulkifli Hasan called the video evidence "very important" and mentioned Indonesia's "target of rhino population growth by three percent per year". On 22 March 2016 it was announced by the WWF that a live Sumatran Rhino was found in Kalimantan; it was the first contact in over 40 years. The rhino, a female, is being transported to a nearby sanctuary.
Iman, the last known Sumatran rhino in Peninsular Malaysia, died in November 2019; stem cell technology is being used in an attempt to revitalize the rhino's population and reverse extinction in the country.
Sumatran rhinoceros