The Teesta River contention between India and Bangladesh epitomizes the intricate nature of transboundary water-sharing arrangements within South Asia, influenced by geopolitical considerations, regional diplomatic efforts, and domestic political factors. Originating from the eastern Himalayas, the Teesta traverses Sikkim and West Bengal prior to entering Bangladesh, and it possesses crucial importance for irrigation, agricultural practices, and energy generation in both nations. Despite the persistence of negotiations aimed at achieving equitable water allocation since the 1950s, a sustainable agreement continues to remain unattainable—largely attributable to resistance from the West Bengal state government in India. The contention has intensified in light of increasing Chinese interest in the Teesta basin and evolving political circumstances in Bangladesh. This research paper investigates the historical context of the dispute, the strategic ramifications of unresolved water-sharing, and the influence of India’s federal structure on diplomatic negotiations. It further analyzes the wider regional repercussions stemming from an extended stalemate. The research posits that addressing the Teesta conundrum is essential for socio-economic advancement in both countries and for maintaining India's influence in Bangladesh in the face of external challenges. The paper promotes a pragmatic and collaborative strategy that reconciles domestic priorities with the imperative for regional stability and equitable water management.