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Cold Water Spring State Preserve is a parcel state preserve protecting a spring that issues from Cold Water Cave, an extensive cave system in Winneshiek County, Iowa and Fillmore County, Minnesota. The spring is a tributary of the Upper Iowa River. The cave system contains a large underground creek that courses around much of the cave's nearly of passages. The cave system has some unusual features such as its rate of expansion, which is higher than that of most caves. It also has relatively low amounts of oxygen and high amounts of carbon dioxide. The cave is a National Natural Landmark, designated in 1987. There are two entries; both are on private property. Coldwater Creek Wildlife Management Area is a state hunting ground near Bluffton, and is near to the cave system. The cave is located in the Driftless Area of Iowa and Minnesota, a region characterized by karst topography, which involves disappearing streams, blind valleys, sinkholes, caves, cold springs, and cold streams, all of which are present here. ==Sources== *(Cold Water Spring State Preserve ) Retrieved July 22, 2007 *(Karstpreserve.com ), retrieved July 22, 2007 *(Interview with John Ackerman, July, 2003 ), retrieved July 22, 2007 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cold Water Spring State Preserve」の詳細全文を読む スポンサード リンク
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