The Indo-European language family is the most widely spoken in the BIMSTEC countries, with over 1.5 billion speakers. The major Indo-European languages spoken in the BIMSTEC countries include Hindi, Bengali, Urdu, Marathi, Gujarati, Punjabi, and Sinhala.

The Indo-European language family is spoken by the largest number of people in Bangladesh, with over 160 million speakers. The major Indo-European languages spoken in Bangladesh include Bengali, Urdu, and English.

The Indo-European language family is spoken by the largest number of people in India, with over 1.2 billion speakers. The major Indo-European languages spoken in India include Hindi, Bengali, Urdu, Marathi, Gujarati, Punjabi, and Telugu.

The Sino-Tibetan language family is spoken by the largest number of people in Myanmar, with over 30 million speakers. The major Sino-Tibetan languages spoken in Myanmar include Burmese, Karen, and Kachin.

The Indo-European language family is spoken by the largest number of people in Nepal, with over 25 million speakers. The major Indo-European languages spoken in Nepal include Nepali, Maithili, and Bhojpuri.

The Indo-European language family is spoken by the largest number of people in Sri Lanka, with over 20 million speakers. The major Indo-European languages spoken in Sri Lanka include Sinhala and Tamil.

The Tai-Kadai language family is spoken by the largest number of people in Thailand, with over 60 million speakers. The major Tai-Kadai languages spoken in Thailand include Thai, Lao, and Shan.

The Sino-Tibetan language family is spoken by the largest number of people in Bhutan, with over 500,000 speakers. The major Sino-Tibetan languages spoken in Bhutan include Dzongkha, Tshangla, and Lhotshamkha.

The Indo-European language family is spoken by the largest number of people in the Maldives, with over 300,000 speakers. The major Indo-European languages spoken in the Maldives include Dhivehi and English.

The Tai-Kadai language family is spoken by the largest number of people in Laos, with over 3 million speakers. The major Tai-Kadai languages spoken in Laos include Lao, Tai Lue, and Tai Dam.

The Austroasiatic language family is spoken by the largest number of people in Cambodia, with over 15 million speakers. The major Austroasiatic languages spoken in Cambodia include Khmer, Mon, and Pear.

The Austroasiatic language family is spoken by the largest number of people in Vietnam, with over 80 million speakers. The major Austroasiatic languages spoken in Vietnam include Vietnamese, Khmer, and Mon.

The Sino-Tibetan language family is spoken by the largest number of people in Myanmar, with over 30 million speakers. The major Sino-Tibetan languages spoken in Myanmar include Burmese, Karen, and Kachin.

The Tai-Kadai language family is spoken by the largest number of people in Thailand, with over 60 million speakers. The major Tai-Kadai languages spoken in Thailand include Thai, Lao, and Shan.

The Sino-Tibetan language family is spoken by the largest number of people in Bhutan, with over 500,000 speakers. The major Sino-Tibetan languages spoken in Bhutan include Dzongkha, Tshangla, and Lhotshamkha.