 Of the rest of the land, or 81.0% is settled (buildings or roads), or 18.3% is either rivers or lakes.Of the built up area, industrial buildings made up 21.0% of the total area while housing and buildings made up 26.6% and transportation infrastructure made up 13.9%.Power and water infrastructure as well as other special developed areas made up 4.0% of the area while parks, green belts and sports fields made up 15.5%.