 Of the rest of the land, or 24.2% is settled (buildings or roads), or 3.5% is either rivers or lakes and or 8.6% is unproductive land.Of the built up area, industrial buildings made up 6.6% of the total area while housing and buildings made up 10.1% and transportation infrastructure made up 4.5%.Power and water infrastructure as well as other special developed areas made up 1.5% of the area while parks, green belts and sports fields made up 1.5%.