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Mark Twain National Forest (MTNF) is a U.S. National Forest located in the southern half of Missouri. MTNF was established on September 11, 1939. It is named for author Mark Twain, a Missouri native. The MTNF covers , of which are Wilderness, and National Scenic River area. MTNF spans 29 counties and represents 11% of all forested land in Missouri. MTNF is divided into six distinct ranger districts: Ava-Cassville-Willow Springs, Eleven Point, Houston-Rolla-Cedar Creek, Poplar Bluff, Potosi-Fredericktown, and the Salem. The six ranger districts actually comprise nine overall unique tracts of forests. Its headquarters are in Rolla, Missouri. Some unique features of the Mark Twain include Greer Spring, which is the largest spring on National Forest land and part of the Eleven Point National Scenic River, and pumps an average of 214 million gallons of water per day into the river.〔http://www.dnr.mo.gov/env/wrc/springsandcaves.htm〕 The public can also visit the Glade Top Trail National Scenic Byway, which offers views of over to the Boston Mountains in Arkansas. The 350-mile Ozark Trail system winds through much of the National Forest. ==History== The Mark Twain National Forest, as we know it today, was created on February 17, 1976. The Mark Twain National forest has a rather unique history – for it was once known as both the Clark National Forest and the Mark Twain National Forest – both being proclaimed on September 11, 1939. In June 1973 the Clark and Mark Twain NF were brought under one headquarters in Rolla and became known as the National forests in Missouri. On Feb. 17, 1976, the forests were combined and renamed the Mark Twain National Forest. Missouri’s only national forest, The Mark Twain, encompasses roughly 1.5 million acres, mostly within the Ozark Highlands. Located across southern Missouri and northern Arkansas, the Ozark Highlands are an ancient landscape characterized by large permanent springs, over 5,000 caves, rocky barren glades, old volcanic mountains and nationally recognized streams. Portions of the Ozarks were never under oceans, nor were the areas glaciated. In the 1870s, citizens of southern Missouri began an era of extensive logging of the state's native oak, hickory, and pine forests. Lumber mills were commonplace, but by the 1920s they had disappeared, along with much of the state's native forests. Thus, in 1939 President Franklin D. Roosevelt signed the MTNF into existence. In March 1933, he also created the Emergency Conservation Work Act, better known as the Civilian Conservation Corps (CCC). In the area that would later become Mark Twain National Forest, hundreds of young men at over fifty CCC sites worked at building roads and planting hundreds of acres of pine to preserve and enhance the natural resources of southern Missouri. Many of their contributions can still be visited and enjoyed today. 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「Mark Twain National Forest」の詳細全文を読む スポンサード リンク
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