Thames21 is a charity organization based in the United Kingdom that focuses on improving the health of the River Thames and its tributaries. Founded in 2000, it engages local communities in various activities, such as river clean-ups, habitat restoration, and educational programs. The organization aims to enhance the river's biodiversity and promote sustainable practices among residents. Through its initiatives, Thames21 encourages volunteers to participate in hands-on projects that foster a sense of stewardship for the river. The charity collaborates with local authorities, businesses, and other organizations to create a cleaner and more vibrant environment along the Thames, benefiting both wildlife and the community.