Gitchie Manitou State Preserve

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43°29′49″N 96°35′31″W / 43.497°N 96.592°W / 43.497; -96.592

Gitchie Manitou is a small (91 acre) nature preserve in Lyon County, in the extreme northwestern corner of Iowa just northwest of Granite, Iowa, or just southeast of Sioux Falls, South Dakota. This natural prairie preserve is noted for its ancient Native American burial mounds and precambrian Sioux Quartzite outcroppings, which are about 1.6 billion years old.