UPSC Civil Services 2011 Prelims General Studies Paper I

Two important rivers–one with its source in Jharkhand (and known by a different name in Odisha), and another, with its source in Odisha–merge at a place only a short distance from the coast of Bay of Bengal before flowing into the sea.
This is an important site of wildlife and biodiversity and a protected area. Which one of the following could be this ?