According to the World Wide Fund for Nature (WWF) the Javan rhino is the most threatened rhino species with only 68–74 remaining in Ujung Kulon National Park in Java, Indonesia. The WWF has listed several threats faced by the Javan rhino that result in its designation as "critically endangered". One of those threats is its "reduced genetic diversity", because the low number of existing Javan rhinos results in a low amount of genetic diversity and increased inbreeding, making it difficult for the Javan rhino to survive. The WWF also identifies "natural disasters" as another threat faced by Javan rhinos, because Ujung National Park can be affected by tsunamis or the explosion of the nearby volcano Anak Krakatau, which potentially could wipe out the entire Javan rhino species. One such eruption and tsunami in 2018 wreaked heavy damage on the Pandeglang Regency, the district which contains Ujung Kulon National Park. However, the park and its rhino population were not significantly affected. A third threat identified by the WWF is "disease", given that four Javan rhinos are believed to have died from a disease transmitted to them by wild cattle. Another threat is "habitat degradation", since the WWF reports that people are encroaching and developing areas near the Ujung National Park and thus destroying the last known habitat of the Javan rhino.