Capture the essence of London’s Waterways. Thames21 2013 annual photography competition opens for entries, in association with the National Maritime Museum. Judged by leading landscape photographer Charlie Waite

Londoners are being called on to take inspiration from renowned photographer and conservationist Ansel Adams to capture the essence of their local waterway. Environmental charity Thames21 is looking for the best images of the capital’s rivers and canals in its annual photography competition. This year, the charity is teaming up with the National Maritime Museum to complement its celebrated exhibition: Ansel Adams Photography: From the Mountains to the Sea, which runs until April 28th.