Wikimapia is an open-content collaborative mapping project aimed to mark all geographical objects in the world and provide a useful description for them. Wikimapia combines interactive web map with a wiki system. Anyone can add a new item to the Wikimapia layer. Both registered users and guests have already marked over 20,000,000 objects and this number grows every day. As of February 2014, over 22,650,000 million objects have been marked by registered users and guests.