Rivers are natural watercourses that flow from higher to lower elevations, typically towards a larger body of water such as an ocean, sea, or lake. They play a crucial role in shaping the landscape, providing habitats for various species, and serving as a vital source of water for human and ecological communities. Research in the field of rivers typically focuses on aspects such as hydrology, geomorphology, ecology, water quality, and management strategies. Scientists study the flow dynamics, sediment transport, biodiversity, and the impact of human activities on river systems to better understand and protect these important natural resources.