Holloway Reservoir is a large water storage facility located in London, England. It was constructed in the mid-19th century to supply drinking water to the growing population of the city. The reservoir is part of the Thames Water network and plays a crucial role in managing water supply and quality. The reservoir has a capacity of approximately 30 million gallons and is surrounded by green spaces, making it a popular spot for local wildlife. It is also an important part of the region's infrastructure, helping to ensure that residents have access to clean and reliable water.