Tierp is a municipality in east central Sweden, in the county of Uppsala. The municipality covers an area of 1543.0 km². Of the total population of 19888, 9980 are male, and 9908 are female. The population density of the community is 13 inhabitants per km².
... in many parts of the island. The clays, which contain layers of good coal and an abundant fossil vegetation, show that during the Miocene period Sakhalin formed part ...