The Upper Peninsula contains 16,377 square miles (42,420 km²), about 29 percent of the land area of the state (exclusive of territorial waters, which constitute about 40% of Michigan's total jurisdictional area).
The maximum east–west distance in the Upper Peninsula is about 320 miles (510 km), and the maximum north–south distance is about 125 miles (201 km).
It is bounded on the north by Lake Superior, on the east by St. Marys River, on the south by Lake Michigan and Lake Huron, and on the west by Wisconsin and (counting the water border on Lake Superior) by Minnesota.
It has about 1,700 miles (2,700 km) of continuous shoreline with the Great Lakes.
There are about 4,300 inland lakes, the largest of which is Lake Gogebic, and 12,000 miles (19,000 km) of streams.

Michigan's Upper Peninsula is bounded on land by Wisconsin to the southwest and west; and in territorial waters by Minnesota to the west, Ontario to the west, north and east, and the Door Peninsula of Wisconsin extends into Lake Michigan east of the western Upper Peninsula.

Five Michigan Upper Peninsula counties include nearby major islands: Mackinac Island, Round Island and Bois Blanc Island in Lake Huron are in Mackinac County; Sugar Island and Neebish Island in the St. Marys River, and Drummond Island in Lake Huron are in Chippewa County; Grand Island is in Alger County; Summer Island is Delta County; and Isle Royale is part of Keweenaw County.
The peninsula is divided between the flat, swampy areas in the east, part of the Great Lakes Plain, and the steeper, more rugged western half, called the Superior Upland, part of the Canadian Shield.
The rock in the western portion is the result of volcanic eruptions and is estimated to be at least 3.5 billion years old (much older than the eastern portion) and contains the region's ore resources.
Banded-iron formations were deposited 2 billion years ago; this is the Marquette Range Supergroup.
A considerable amount of bedrock is visible.
Mount Arvon, the highest point in Michigan, is found in the region, as well as the Porcupine and Huron mountains.
All of the higher areas are the remnants of ancient peaks, worn down over millions of years by erosion and glaciers.

The Keweenaw Peninsula is the northernmost part of the peninsula (not counting Isle Royale, which is politically part of the UP).
It projects into Lake Superior and was the site of the first copper boom in the United States, part of a larger region of the peninsula called the Copper Country.
Copper Island is its northernmost section.
Its lowest elevation is along the shoreline of Lake Huron and Lake Michigan, averaging 577 feet (176 m) above sea level.
Its highest elevation is Mount Arvon, at 1,979 feet (603 m).

About one third of the peninsula is government-owned recreational forest land today, including the Ottawa National Forest and Hiawatha National Forest.
Although heavily logged in the 19th century, the majority of the land was forested with mature trees by the 1970s.
The Upper Peninsula contains 16,377 square miles (42,420 km²), about 29 percent of the land area of the state (exclusive of territorial waters, which constitute about 40% of Michigan's total jurisdictional area). The maximum east–west distance in the Upper Peninsula is about 320 miles (510 km), and the maximum north–south distance is about 125 miles (201 km). It is bounded on the north by Lake Superior, on the east by St. Marys River, on the south by Lake Michigan and Lake Huron, and on the west by Wisconsin and (counting the water border on Lake Superior) by Minnesota. It has about 1,700 miles (2,700 km) of continuous shoreline with the Great Lakes. There are about 4,300 inland lakes, the largest of which is Lake Gogebic, and 12,000 miles (19,000 km) of streams.
Michigan's Upper Peninsula is bounded on land by Wisconsin to the southwest and west; and in territorial waters by Minnesota to the west, Ontario to the west, north and east, and the Door Peninsula of Wisconsin extends into Lake Michigan east of the western Upper Peninsula. 
Five Michigan Upper Peninsula counties include nearby major islands: Mackinac Island, Round Island and Bois Blanc Island in Lake Huron are in Mackinac County; Sugar Island and Neebish Island in the St. Marys River, and Drummond Island in Lake Huron are in Chippewa County; Grand Island is in Alger County; Summer Island is Delta County; and Isle Royale is part of Keweenaw County.The peninsula is divided between the flat, swampy areas in the east, part of the Great Lakes Plain, and the steeper, more rugged western half, called the Superior Upland, part of the Canadian Shield. The rock in the western portion is the result of volcanic eruptions and is estimated to be at least 3.5 billion years old (much older than the eastern portion) and contains the region's ore resources. Banded-iron formations were deposited 2 billion years ago; this is the Marquette Range Supergroup. A considerable amount of bedrock is visible. Mount Arvon, the highest point in Michigan, is found in the region, as well as the Porcupine and Huron mountains. All of the higher areas are the remnants of ancient peaks, worn down over millions of years by erosion and glaciers.
The Keweenaw Peninsula is the northernmost part of the peninsula (not counting Isle Royale, which is politically part of the UP). It projects into Lake Superior and was the site of the first copper boom in the United States, part of a larger region of the peninsula called the Copper Country. Copper Island is its northernmost section. Its lowest elevation is along the shoreline of Lake Huron and Lake Michigan, averaging 577 feet (176 m) above sea level. Its highest elevation is Mount Arvon, at 1,979 feet (603 m).
About one third of the peninsula is government-owned recreational forest land today, including the Ottawa National Forest and Hiawatha National Forest. Although heavily logged in the 19th century, the majority of the land was forested with mature trees by the 1970s.
Upper Peninsula of Michigan