Leigh Marshes is a natural area located in Essex, England, known for its rich biodiversity and unique wetland ecosystem. The marshes are home to various species of birds, plants, and insects, making it an important habitat for wildlife. The site is part of the Thames Estuary and features a mix of salt marshes and mudflats. It serves as a vital feeding ground for migratory birds and offers opportunities for nature enthusiasts to observe and appreciate the local flora and fauna.