Crossness Nature Reserve is a protected area located in Bexley, London, known for its diverse habitats and rich wildlife. The reserve features wetlands, grasslands, and woodlands, making it an important site for various bird species and other wildlife. It is a popular spot for nature enthusiasts and offers walking paths for visitors to explore. Established in 2000, Crossness Nature Reserve is managed by Thames21 and aims to promote biodiversity and conservation. The reserve also plays a role in flood management, helping to protect surrounding areas from flooding while providing a natural space for recreation and education.