Mountain ecosystems, often referred to as the “water towers” of the world, are critical for human survival due to their multifaceted ecological, hydrological, climatic, and socio-economic functions. These ecosystems, which include high-altitude forests, alpine meadows, glaciers, and freshwater lakes, provide essential resources that sustain human populations both locally and downstream. The importance of mountain ecosystems is particularly evident when examined through the lens of aquatic ecosystems, as mountains play a central role in maintaining the quality, quantity, and distribution of freshwater resources. One of the most significant contributions of mountain ecosystems is their role as sources of freshwater. Mountains are the origin of most of the world’s major rivers, including the Ganges, Yangtze, Amazon, Nile, and Mekong. The precipitation they receive, whether in the form of rain or snow, accumulates in snowpacks and glaciers, gradually releasing water throughout the year. This seasonal melting regulates river flow, ensuring a continuous supply of water even during dry periods. For humans, this hydrological function is indispensable: it provides water for drinking, irrigation, industrial use, and hydroelectric energy. In addition, mountain lakes and wetlands act as natural reservoirs, filtering water and maintaining water quality by trapping sediments and pollutants. The interdependence between mountain ecosystems and human societies underscores the critical role of mountains in sustaining freshwater availability for millions of people worldwide. Mountains also act as natural buffers against extreme weather events, directly impacting aquatic ecosystems and human livelihoods. Their terrain influences local and regional climate patterns, including rainfall distribution, temperature regulation, and wind flow. This climatic moderation is essential for maintaining river ecosystems and aquatic biodiversity downstream. For instance, forests on mountain slopes reduce soil erosion and surface runoff, preventing siltation in rivers and lakes. Excessive sedimentation can degrade aquatic habitats, reducing fish populations and affecting water quality. By stabilizing soils and regulating water flow, mountain ecosystems help preserve the health of freshwater ecosystems, which in turn ensures