Waddon Marsh is a natural area located in the London Borough of Croydon, England. It features a mix of wetlands, grasslands, and woodlands, providing a habitat for various wildlife species. The marsh is part of the Wandle Valley Regional Park, which aims to protect and enhance the local environment. The area is accessible to the public, offering walking paths and opportunities for birdwatching. Waddon Marsh plays a role in flood management by absorbing excess rainwater, helping to reduce the risk of flooding in surrounding neighborhoods. It serves as a valuable green space for both residents and visitors.