The countries of the Bay of Bengal include littoral and landlocked countries in South Asia and Southeast Asia that depend on the bay for maritime usage. Historically, the Bay of Bengal has been a highway of transport, trade, and cultural exchange between diverse peoples encompassing the Indian subcontinent, Indochinese peninsula, and Malay Archipelago. Today, the Bay of Bengal region is the convergence of two major geopolitical blocs- the Association of Southeast Asian Nations (ASEAN) and the South Asian Association for Regional Cooperation (SAARC). The Bay of Bengal Initiative for Multisectoral Technical and Economic Cooperation (BIMSTEC) promotes regional engagement in the area.
The Bay of Bengal countries are often categorized into a maritime subregion. The bay hosts vital shipping routes linking its littoral and landlocked hinterland with the Indian Ocean. Its sea bed is being explored and exploited for hydrocarbon reserves.