The Japanese archipelago is 66.4% forests, 12.8% agricultural and 4.8% residential (2002). The primarily rugged and mountainous terrain is restricted for habitation. Thus the habitable zones, mainly in the coastal areas, have very high population densities: Japan is the 40th most densely populated country. Honshu has the highest population density at 450/km2 (1,200/sq mi) as of 2010, while Hokkaido has the lowest density of 64.5 persons/km2 as of 2016. , approximately 0.5% of Japan's total area is reclaimed land (). Lake Biwa is an ancient lake and the country's largest freshwater lake.