In Sarawak, less than 1,000 animals are thought to remain in patchily distributed populations. In Sabah, the only remaining large populations are in the Kinabatangan flood plain, and around Dewurst Bay in the Eastern Deltas. Brunei estuaries support one population. The species is in greater abundance in Kalimantan (Indonesian Borneo), where Meijaard surveyed the population. The Indonesian populations range in size from over 1,000 to less than 100, depending on past and current threats (Meijaard and Nijman 2000). The Pulau Kaget Nature Reserve population in South Kalimantan has reportedly been extinct since 1997 (Meijaard and Nijman 2000). Also, the population in the Mahakam Delta, East Kalimantan which would have numbered in the thousands up until the early 1990s, has now been decimated due to conversion of the coastal swamps to shrimp farms (E. Meijaard pers. comm.).
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