Canaan Valley () is a large bathtub-shaped upland valley in northeastern Tucker County, West Virginia, USA. Within it are extensive wetlands and the headwaters of the Blackwater River which spills out of the valley at Blackwater Falls. It is a well-known and partially undeveloped scenic attraction and tourist draw. Since 1994, almost 70% of the Valley has become the Canaan Valley National Wildlife Refuge, the nation's 500th National Wildlife Refuge, with Canaan Valley Resort State Park and Blackwater Falls State Park nearby. Canaan Valley was designated a National Natural Landmark in 1974. The National Park Service citation indicates that the Valley is "a splendid 'museum' of Pleistocene habitats ... contain[ing] ... an aggregation of these habitats seldom found in the eastern United States. It is unique as a northern boreal relict community at this latitude by virtue of its size, elevation and diversity." The local pronunciation of "Canaan" is , rather than the conventional for the Biblical region from which the area questionably takes its name. According to legend, this is the result of improper pronunciation by the person who named the valley. Geography The Valley, nestled among the higher backbone ranges of the Allegheny Mountains, is about long and wide. It is defined by Canaan Mountain to the west and Cabin Mountain to the east. The northern half of Cabin Mountain is part of the Eastern Continental Divide. The Valley encompasses approximately 25,000 acres (although the greater Valley ecosystem is sometimes considered to consist of about 36,000 acres). The average valley floor elevation is above sea level, making it the highest sizable valley east of the Mississippi River. The surrounding mountains extend upward an additional at the summit of Weiss Knob on the southeastern rim of the valley. The Blackwater River originates in the southern part of the Valley. The Falls of the Blackwater represent part of a water gap through which the river exits the Valley between Brown and Canaan Mountains before cascading through Blackwater Canyon. Geology Canaan Valley — like the very similar Burke's Garden in Virginia — is a southern "muskeg" occupying an anticline valley. The Valley itself is carved into the low dome of sedimentary rock known as the Blackwater Anticline, exposing the soft shales of the Mauch Chunk Formation. In the Canaan Valley region, the Blackwater River began carving into the underlying sedimentary rock layers of Mississippian and Pennsylvanian age (345–270 million years ago)