Quick answer
IUCN status: Least ConcernAsian water monitor at a glance
The Asian water monitor (Varanus salvator) is a reptile in the family Varanidae. Range in Indonesia: Sumatra, Java, Bali, Kalimantan and parts of Sulawesi and Nusa Tenggara; varies by subspecies. Diet: small animals and carrion; a carnivore. IUCN Red List status: Least Concern.
| Scientific name | Varanus salvator |
|---|---|
| Indonesian name | Biawak air |
| Group | Reptiles |
| Family | Varanidae |
| Range in Indonesia | Sumatra, Java, Bali, Kalimantan and parts of Sulawesi and Nusa Tenggara; varies by subspecies |
| Linked habitats | Mangroves, Freshwater Wetlands |
| Habitat | Rivers, swamps, mangroves and wetlands |
| Food | Small animals and carrion |
| Lifestyle | Semi-aquatic; can climb |
| IUCN status | Least Concern · IUCN Red List (via GBIF) · checked 1 October 2026 |
| Body length | Can reach 3 m, but most adults are at most about 1.5 m · Animal Diversity Web — Varanus salvator |
| Diet type | Carnivore (meat-eater) — predator and scavenger · Animal Diversity Web |
| Reproduction | Laying eggs (oviparous) · Reptile Database |
| Venom or poison | Mildly venomous (weak venom for people) · Fry et al. 2010, Functional and structural diversification of the Anguimorpha lizard venom system (Mol Cell Proteomics; V. salvator from Bali examined) |
| Active | Diurnal (active by day) · ReptTraits v1-2 (Oskyrko et al. 2024, Scientific Data 11:243), column 'Active time' |
In this guide (11)
Recognising a water monitor
The Asian water monitor is a large lizard with a dark body, paler markings, long tail and strong limbs. Pattern can change with age and vary among populations. It is not a Komodo dragon: both belong to Varanus, but they are different species with different ranges and habitat contexts.
Evidence: Animal Diversity Web — Varanus salvator: biology ↗ · The Reptile Database — Varanus salvator and subspecies ↗
Following water across landscapes
Sarawak’s forestry department records water monitors in coastal mangroves, riverine forest, wetlands and human-used land. Their association with water helps explain sightings along drains and urban edges. Records in disturbed places are no reason to treat natural swamps and mangroves as unimportant.
Evidence: Sarawak Forest Department — water monitor habitat ↗ · Singapore AVS — monitor lizards and encounters ↗
Predator and scavenger
Water monitors take varied prey, including fish, frogs, crabs and other small animals, and also consume carrion when available. A monitor near waste is therefore not simply a “garbage eater.” Easily available human food can alter its movements and increase unwanted encounters.
Evidence: Animal Diversity Web — Varanus salvator: biology ↗ · Singapore AVS — monitor lizards and encounters ↗ · Shine et al. (1996) — southern Sumatra harvest study, author repository abstract ↗
Safer encounters
Do not approach, touch, feed or block a monitor’s escape route. A cornered animal may defend itself. If one enters a building or crowded area, keep people and pets back and seek help from local wildlife authorities. Singapore’s official guidance likewise advises the public not to handle monitors themselves.
Pressures and limits of sighting data
Research in southern Sumatra documented water-monitor harvesting for skins and examined how ecological flexibility affected persistence. Historic findings from one area cannot serve as a current harvest figure or status for all Indonesia. Photographic records are not a census either; local assessment needs surveys, habitat context and up-to-date trade data.
Evidence: Shine et al. (1996) — southern Sumatra harvest study, author repository abstract ↗ · GBIF — what occurrence records document ↗
Explore related habitats
These habitat relationships are supported by species sources in this guide. This is not a complete range map.
Scientific classification of the Asian water monitor
| Kingdom | Animalia |
|---|---|
| Phylum | Chordata |
| Class | Reptilia |
| Order | Squamata |
| Family | Varanidae |
| Genus | Varanus |
| Species | Varanus salvator |
Source: GBIF Backbone Taxonomy, adjusted to the ranks commonly used in school biology (for example class Reptilia).
Common questions about the Asian water monitor
What is the scientific name of the Asian water monitor?
The scientific name of the Asian water monitor is Varanus salvator, in the family Varanidae. In Indonesian it is called Biawak air.
What kind of animal is the Asian water monitor?
The Asian water monitor is a reptile in the family Varanidae. By diet it is a carnivore (meat-eater): a predator and scavenger.
Where does the Asian water monitor live in Indonesia?
In Indonesia, this guide records the Asian water monitor in: Sumatra, Java, Bali, Kalimantan and parts of Sulawesi and Nusa Tenggara; varies by subspecies.
Source-supported habitats: Mangroves, Freshwater Wetlands.
What does the Asian water monitor eat?
Diet of the Asian water monitor: small animals and carrion. That makes it a carnivore (meat-eater). Source: Animal Diversity Web.
How does the Asian water monitor reproduce?
The Asian water monitor reproduces by laying eggs (oviparous). Source: Reptile Database.
Is the Asian water monitor venomous?
Yes. The Asian water monitor is mildly venomous (weak venom for people). Like other monitors it has venom glands, but effects of its venom on people are undocumented; its bite can still cause serious lacerations. Source: Fry et al. 2010, Functional and structural diversification of the Anguimorpha lizard venom system (Mol Cell Proteomics; V. salvator from Bali examined).
Do not catch, handle or disturb wild animals. If bitten, stung or exposed to its toxins, go to the nearest health facility straight away.
Is the Asian water monitor nocturnal?
The cited source records the Asian water monitor as diurnal (active by day). Source: ReptTraits v1-2 (Oskyrko et al. 2024, Scientific Data 11:243), column 'Active time'.
See also the list of nocturnal and diurnal animals in Indonesia.
What are the main features of the Asian water monitor?
Key features of the Asian water monitor, from this guide’s sources: Body length: Can reach 3 m, but most adults are at most about 1.5 m.
How big is the Asian water monitor?
Body length: Can reach 3 m, but most adults are at most about 1.5 m. Source: Animal Diversity Web — Varanus salvator.
What is the scientific classification of the Asian water monitor?
Scientific classification of the Asian water monitor: kingdom Animalia, phylum Chordata, class Reptilia, order Squamata, family Varanidae, genus Varanus, species Varanus salvator.
Source: GBIF Backbone Taxonomy, adjusted to the ranks commonly used in school biology.
Is the Asian water monitor endangered?
No, according to the global IUCN assessment. On the IUCN Red List, the Asian water monitor is listed as Least Concern: it does not qualify for a threatened category or for Near Threatened in the global assessment. Source: IUCN Red List (via GBIF), checked 1 October 2026.
This global category is separate from legal protection in Indonesia. To check whether the Asian water monitor is a protected species, consult the current national list of protected species or contact the local BKSDA (natural resources conservation office).
Compare with similar animals
Sources & references
- Animal Diversity Web — Varanus salvator: biology ↗
- The Reptile Database — Varanus salvator and subspecies ↗
- Sarawak Forest Department — water monitor habitat ↗
- Singapore AVS — monitor lizards and encounters ↗
- Shine et al. (1996) — southern Sumatra harvest study, author repository abstract ↗
- GBIF — what occurrence records document ↗
- Reptile Database ↗
- ReptTraits v1-2 (Oskyrko et al. 2024, Scientific Data 11:243), column 'Active time' ↗
- Fry et al. 2010, Functional and structural diversification of the Anguimorpha lizard venom system (Mol Cell Proteomics; V. salvator from Bali examined) ↗
- GBIF Backbone Taxonomy (GBIF) ↗
- IUCN Red List of Threatened Species, version 2026-1, via GBIF (CC BY 4.0) ↗
References can change. Check dates and context in the original source. How we use sources and data →
National parks where it is recorded
According to the official national park profiles from the KSDAE directorate. The animal may also live elsewhere.
Further reading
Monitor lizard: facts, threats and conservation ↗ — World Animal Rescue Network. A broader overview that covers this animal.
Related site: PanduanHewan’s founder is also a director of World Animal Rescue Network.
Cite this page
Credit PanduanHewan when referring to this page. Check the original evidence sources before reusing a claim.
PanduanHewan. Asian water monitor (Varanus salvator). Last substantive update: 7 October 2026. https://panduanhewan.org/en/species/varanus-salvator/