Introduction Lakes form a critical component of India’s geography, ecology, and human livelihood systems. For aspirants of the Union Public Service Commission (UPSC) Civil Services Examination (CSE), knowledge of lakes is relevant not only for Prelims (GS1 Geography) but also for Mains (linkages with environment, water-resources, biodiversity). In India, lakes are formed by tectonic, glacial, fluvial, man-made, and meteorite-impact processes. For example, the Wular Lake in Jammu & Kashmir is one of the largest freshwater lakes, formed by tectonic activity. Understanding their causes, significance and current relevance is essential for UPSC answer-writing. Causes, Impacts & Significance of Major Lakes in India 1. Formation and Types of Lakes Tectonic lakes : e.g., Wular Lake – created by tectonic subsidence. Glacial / high-altitude lakes : e.g., in Himalayas – relevant for climate change and river-fed systems. Meteorite-impact lakes : e.g., Lonar Lake in Maharashtra...