Riau Archipelago
One of the most widespread "Nepenthes" species, "N. ampullaria" is native to Borneo, the Maluku Islands, New Guinea, Peninsular Malaysia, Singapore, Sumatra, and Thailand. It has also been recorded from many smaller islands, including Bangka, Bengkalis, Ko Lanta, Ko Tarutao, Langkawi, Mendol, Mentawai Islands (Siberut), Meranti Islands (Padang, Rangsang, Tebing Tinggi), Nias, Penang, Riau Islands (Lingga Islands, Natuna Islands, Riau Archipelago), and Rupat.