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Christmas Valley Sand Dunes
The Christmas Valley Sand Dunes are a natural sand dune complex covering of public lands east of Christmas Valley in Lake County, Oregon, United States, about southeast of Bend. The area is accessible via the Christmas Valley National Back Country Byway.〔http://www.christmasvalley.org/sanddunes.php〕 The dunes are up to high.〔 It is the largest inland shifting sand dune system in the Pacific Northwest.〔(【引用サイトリンク】title= Christmas Valley )〕 The dunes are composed mostly of ash and pumice from the eruption of Mount Mazama that formed Crater Lake 7,000 years ago.〔(Christmas Valley Sand Dunes: Area of Critical Environmental Concern ) (PDF) brochure from the BLM〕 Approximately of dunes are open to vehicles.〔
==Administration==
The Christmas Valley Sand Dunes area is administered by Bureau of Land Management. The Bureau of Land Management also oversees the Lost Forest Research Natural Area, east of the dunes as well as the land around nearby Fossil Lake to the west In 1983, the Bureau of Land Management joined the Christmas Valley Sand Dunes, Lost Forest Research Natural Area, and Fossil Lake into a single Area of Critical Environmental Concern. There are vehicle restrictions in much of the consolidated Area of Critical Environmental Concern. However, approximately of dune area remains open to vehicle use. Off-road vehicles are allowed only on specific routes and in designated areas. Camping is restricted to designated sites within the Area of Critical Environmental Concern. All of the camp sites are primitive with no water or restrooms. The nearest public facilities are located in the unincorporated community of Christmas Valley, approximately away.〔(Lost Forest Research Natural Area ) (PDF), ''Christmas Valley Sand Dunes Area of Critical Environmental Concern'', Lakeview District, Bureau of Land Management, United States Department of Interior, Lakeview, Oregon, 2005.〕〔Chadwick, Kristen L. and Andris Eglitis, ( ''Health Assessment of the Lost Forest Research Natural Area'' ) (PDF), Central Oregon Service Center for Insects and Diseases, United States Forest Service, United States Department of Agriculture, Bend, Oregon, February 2007, pp.1-2.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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