Lena Delta, Russia

The Lena River is one of the largest rivers in the world, and is 4,500km long. The Lena Delta Reserve is the most extensive protected wilderness area in Russia. It is an important refuge and breeding grounds for many species of Siberian wildlife. Original image here.

The Parana River Delta is northeast of Buenos Aires, Argentina and as a forested marshland is one of the world"s greatest bird-watching destinations.