Stockholm is the capital city of Sweden located on the Baltic Sea. Over 30% of the city is made up of waterways and parks. The city has a long history of sustainable urban planning dating back to the 1930s when it began planning for a radial development pattern with green spaces between urban areas connected by public transportation. Today, Stockholm has an extensive public transportation system including commuter rail, subway, and busses. Planning in Stockholm is a cooperative process involving citizens, agencies, and private groups.