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The Sibley Peninsula is a long and wide peninsula in Ontariomarker, Canadamarker on Lake Superiormarker. It projects into the lake from its north shore, and separates Thunder Baymarker to the west from Black Bay to the east.

Sleeping Giant Provincial Parkmarker occupies most of the peninsula. The Sleeping Giantmarker is a large rock formation along the peninsula which resembles a human figure lying on its back. Thunder Cape Bird Observatory is located at its southern tip. Highway 587 runs along the peninsula from Highway 17 to Silver Isletmarker.

The peninsula was named after Alexander H. Sibley, president of the Silver Islet Mining Company that developed a mine there.


The peninsula can be separated into two physiographic areas—highlands and lowlands. The highlands dominate the western half of the peninsula, and rise to above the surface of Lake Superior. The lowlands of the eastern portion of the peninsula rise to only , over an area 3 to 6 kilometres (2 to 4 mi) wide. With the exception of diabase dikes and the large diabase sill that forms the upper portion of the Sleeping Giant, the peninsula is underlain by sedimentary rocks, which strike northeast and slope towards the southwest, forming a cuesta.


Sibley Peninsula has archaeolgical sites from Paleoindian, arachaic, and woodland settlements.
 In 1868 silver was discovered, and from 1870 to 1884 the mine at Silver Isletmarker was the richest silver mine in the world.


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