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1. Mekong River / 4,023 km / China, Burma, Laos, Thailand, Cambodia, Vietnam (10th in the world) 2. Thanlwin River / 2,815 km / China, Burma, Thailand 3. Irrawaddy River / 2,170 km / Burma 4. Chindwin River / 1,207 km / Burma 5. Kapuas River / 1,143 km / Indonesia (World’s Longest River on an Island) 6. Fly River / 1,050 km / Papua New Guinea 7. Mahakam River / 980 km / Indonesia 8. Chi River (แม่น้ำชี) / 765 km / Thailand 9. Musi River / 750 km / Indonesia 10. Mun River (แม่น้ำมูล) / 673 km / Thailand 11. Nan River / 627 km / Thailand 12. Ca River / 612 km / Laos, Vietnam 13. Rajang River / 563 km / Malaysia 14. Kinabatangan River / 560 km / Malaysia 15. Bengawan Solo River / 540 km / Indonesia 16. Digul River / 525 km / Indonesia 17. Pa Sak River (แม่น้ำป่าสัก) / 513 km / Thailand 18. Pahang River / 459 km / Malaysia 19. Cagayan River / 446 km / Philippines 20. Sittang River / 420 km / Burma 21. Songkhram River (ลำน้ำสงคราม) / 420 km / Thailand 22. Ma River / 400 km / Vietnam, Laos 23. Khwae Yai River (แม่น้ำแควใหญ่) / 380 km / Thailand 24. Chao Phraya River / 372 km / Thailand 25. White Wang River (วัง) / 335 km / Thailand 26. Moei River (เมย) / 327 km / Thailand 27. Mali River / 320 km / Burma 28. Rio Grande de Mindanao / 320 km / Philippines 29. Ing River (อิง) / 300 km / Thailand 30. Gianh River / 268 km / Vietnam