The present Doodle celebrates the Wadden Sea, the world's biggest network of intertidal sand and mudflats, which spans the coastlines of the Netherlands, Germany, and Denmark. On this day in 2009, UNESCO designated the Wadden Sea a World Heritage Site in recognition of its unparalleled ecological and geological importance and the times of exertion devoted to its preservation. Made by storms during the 14th and 15th centuries, the Wadden Sea is a moderately young wetland environment that involves one of the world's final undisturbed undisturbed intertidal ecosystems. This magnificent stretch of sea and sand houses various plant and animal species, including the grey seal and harbor porpoise. Considered perhaps the most basic districts all around the world for migratory birds, it's assessed that the wetlands are visited by more than 10 million African-Eurasian birds every year and can harbor up to 6.1 million birds on the double! The Wadden Sea isn't only a pristine habitat for wildlife—popular ways human visitors enjoy the scenery include exploring the mudflats at low tide or visiting the boundary islands by boat. In any case, tourists should regard the site’s essential role in keeping up with global biodiversity. Current conservation endeavors are grounded in an strategic partnership between UNESCO, environmental NGOs, the Wadden Sea Forum, and the governments of Denmark, Germany, and the Netherlands so people in the future can appreciate this natural phenomenon. Here's to the Wadden Sea and preserving more than 4,000 square miles of the natural world!