The IMT-GT currently consists of :

• 14 provinces in Southern Thailand (Krabi, Nakhon Si Thammarat, Narathiwat, Pattani, Phattalung, Satun, Songkhla, Trang, Yala, Chumphon, Ranong, Surat Thani, Phang Nga, Phuket)
• 8 states of Peninsular Malaysia (Kedah, Kelantan, Melaka, Negeri Sembilan, Penang, Perak, Perlis and Selangor)
• 10 provinces in the island of Sumatra in Indonesia (Aceh, Bangka-Belitung, Bengkulu, Jambi, Lampung, North Sumatra, Riau, Riau Islands, South Sumatra, and West Sumatra)

More information Click :: http://www.imtgt.org