the Northern Highland has massive mixed hardwood and coniferous forests including the Chequamegon-Nicolet National Forest, as well as thousands of glacial lakes, and the state's highest point, Timms Hill. In the middle of the state, the Central Plain has some unique sandstone formations like the Dells of the Wisconsin River in addition to rich farmland. The Eastern Ridges and Lowlands region in the southeast is home to many of Wisconsin's largest cities. The ridges include the Niagara Escarpment that stretches from New York, the Black River Escarpment and the Magnesian Escarpment. In the southwest, the Western Upland is a rugged landscape with a mix of forest and farmland, including many bluffs on the Mississippi River. This region is part of the Driftless Area, which also includes portions of Iowa, Illinois, and Minnesota. This area was not covered by glaciers during the most recent ice age, the Wisconsin Glaciation. Overall, 46% of Wisconsin's land area is covered by forest. Langlade County has a soil rarely found outside of the county called Antigo silt loam. Wisconsin has sister-state relationships with Germany's Hesse, Japan's Chiba Prefecture, Mexico's Jalisco, China's Heilongjiang, and Nicaragua. Climate Most of Wisconsin is classified as warm-summer humid continental climate (Köppen Dfb), while southern and southwestern portions are classified as hot-summer humid continental climate (Köppen Dfa). The highest temperature ever recorded in the state was in the Wisconsin Dells, on July 13, 1936, where it reached 114 °F (46 °C). The lowest temperature ever recorded in Wisconsin was in the village of Couderay, where it reached −55 °F (−48 °C) on both February 2 and 4, 1996. Wisconsin also receives a large amount of regular snowfall averaging around in the southern portions with up to annually in the Lake Superior snowbelt each year. Demographics Population The United States Census Bureau estimates that the population of Wisconsin was 5,822,434 on July 1, 2019, a 2.4% increase since the 2010 United States census. This includes a natural increase since the last census of 150,659 people (i.e., 614,771 births minus 464,112 deaths) and a decrease due to net migration of 12,755 people. Immigration resulted in a net increase of 59,251 people, and migration from within the U.S. resulted in a net decrease of 72,006 people. According to the 2016 American Community Survey, 6.5% of Wisconsin's population were of Hispanic or Latino origin (of any race): Mexican (4.7%), Puerto Rican (0.9%), Cuban (0.1%), and