Catchments, also known as watersheds or drainage basins, are areas of land that are drained by a single water body such as a river, stream, or lake. Catchments play a crucial role in the water cycle as they collect and channel rainfall and surface water runoff to a common outlet. They can vary in size from small to large and are often defined by natural boundaries such as hills or mountains. Research in catchments focuses on understanding the hydrological processes that occur within these areas, including the movement of water, sediment, nutrients, and pollutants. This research is important for managing water resources, predicting floods and droughts, and assessing the impact of land use changes on water quality and quantity. Studies in catchments may involve collecting data on streamflow, water quality, soil moisture, and vegetation cover, as well as using computer models to simulate and predict water-related processes. Researchers may also investigate the effects of climate change, land use practices, and pollution on catchment hydrology. Overall, research in catchments plays a critical role in advancing our understanding of how water moves through and interacts with the landscape.