WikiMapia

Not to be confused with Wikimaps or Wikimedia. WikiMapia is an open-content collaborative mapping project aimed to mark all geographical objects in the world and provide a useful description for them. It combines interactive web map with a wiki system. Both registered users and guests have already marked over 18,000,000 objects and this number grows every day. Currently over 1,500,000 people joined Wikimapia community. All content added by users is available under Creative Commons license through the web application and API.