Anthracoceros malayanus is confined to the Sundaic lowlands of peninsular Thailand, Sabah, Sarawak and Peninsular Malaysia, Kalimantan and Sumatra (including the Lingga, Bangka, Belitung islands), Indonesia and Brunei (common), in lowland primary and logged forests and swamp forests, usually below 500 m. Forest destruction in the Sundaic lowlands of Indonesia has been so extensive that all primary formations are expected to disappear by 2010, and the situation is little different in Thailand and Malaysia. It is more tolerant of secondary and regenerating areas than other hornbills, but its dependence on plains-level habitats has removed it from much of its former range, especially in Thailand where it is on the verge of extinction. CITES Appendix II.