Abstract While the focus of this volume is Myanmar, some of the basins that are the subject of earlier chapters extend into adjoining countries or their offshore exclusive economic zones (EEZs). In this chapter we look briefly at the progress of exploration in adjoining areas of India (the Andaman Islands), Bangladesh and Thailand. We see that success has so far eluded exploration in Thailand’s EEZ and that of the Andaman Islands, despite seismic and drilling activities over several decades. On the other hand, north from Myanmar’s Rakhine Basin (offshore and onshore) in Bangladesh, substantial gas reserves have been discovered and developed. The stratigraphy and petroleum-system elements for Bangladesh are summarized in Figure 10.1. Proven source rocks occur through the Eocene–Pliocene succession and include the Tura, Sylhet, Kopili, Jenum and Bhuban formations. Miocene sandstone reservoirs comprise the Bhuban and Boka Bil formations (sealed by the Upper Manna Shale) and the Pliocene sandstones of the Tipam Formation are sealed by the Girujan Formation shales. The producing fields are predominantly gas and are onshore, the main exception being the offshore Sangu Field which is closest to the northern Rakhine discoveries of Myanmar. The Hatia Trough–Tripura Foldbelt in SE Bangladesh is the NW continuation of Myanmar’s offshore Rakhine Basin. This foredeep basin lies in the main depocentre of the Bengal Fan (Curray et al. 2003). The Sangu Field lies in very shallow water at the head of the Bay of Bengal, some 45 km southwest of Chittagong. It was discovered by Cairn in 1996 and brought on stream in 1998.