Mnjikaning Fish Weirs

The Mnjikaning Fish Weirs are one of the oldest human developments in Canada. These fishing weirs were built by the first nations people well before recorded history, dating to about 3,300 BCE during the Archaic period in North America, according to carbon dating done on some of the wooden remnants. The weirs were built in the narrows between Lake Couchiching and Lake Simcoe, now known as Atherley Narrows,^[1] over which Ontario Highway 12 passes today. They were preserved by the water and layers of protective silt.

• http://en.wikipedia.org/wiki/Mnjikaning Fish Weirs