Wilstone Reservoir is a large body of water located in Hertfordshire, England. It was constructed in the 19th century to supply drinking water to the surrounding areas. The reservoir is part of the Tring Reservoirs complex and is known for its scenic views and diverse wildlife. The area around Wilstone Reservoir is popular for walking, birdwatching, and enjoying nature. It is home to various species of birds, making it a favorite spot for birdwatchers. The reservoir also plays a crucial role in local water management and conservation efforts.