Northern Michigan—or more properly Northern Lower Michigan—is a region of the U.S. state of Michigan (known colloquially to residents of more southerly parts of the state as "up north"), popular as a tourist destination. It is home to several small- to medium-sized cities, extensive state and national forests, lakes and rivers, and a large portion of Great Lakes shoreline. The region has a significant seasonal population much like other regions that depend on tourism as their main industry.
Upper Peninsula---across the Straits of Mackinac, to the north, west and northeast, lies the Upper Peninsula of Michigan (the "U.P."). Despite its geographic location as the most northerly part of Michigan, the Upper Peninsula is not usually included in the definition of Northern Michigan (although Northern Michigan University is located in the U.P. city of Marquette), and is instead regarded by Michigan residents as a distinct region of the state. The two regions are connected by the Mackinac Bridge.