Five Indian states share a border with Bangladesh including West Bengal, Assam, Meghalaya, Tripura, and Mizoram. West Bengal has the longest stretch with about 2,217 km, followed by Tripura (856 km), Meghalaya (443 km), Mizoram (318 km), and Assam (262 km). This combined border is India’s longest international land boundary, stretching over 4,000 kilometres.