(a) Name. The name of the viticultural area described in this section is “Arkansas Mountain.”

(b) Approved maps. The appropriate maps for determining the boundary of the Arkansas Mountain viticultural area are two U.S.G.S. maps, titled:

(1) Russellville, Arkansas, 1:250,000 series compiled in 1954.

(2) Fort Smith, Arkansas-Oklahoma, 1:250,000 series, 1978.

(c) Boundary—(1) General. The Arkansas Mountain viticultural area is located in northwestern Arkansas. Starting at the point where Frog Bayou converges with the Arkansas River, near Yoestown, Arkansas (or the Fort Smith map), the boundary proceeds:

(2) Boundary Description. (i) Southwestward along the Arkansas River to Vache Grasse Creek.

(ii) Then southeastward and southwestward following Vache Grasse Creek to the place where it is crossed by Arkansas Highway 10, near Greenwood, Arkansas.

(iii) From there westward along Highway 10 to U.S. Highway 71. (Note: Highway 10 is the primary highway leading to Greenwood to Hackett, Arkansas.)

(iv) Then southward and eastward along Highway 71 until it crosses Rock Creek.

(v) Then northeastward along Rock Creek to Petit Jean Creek.

(vi) Then generally northeastward and eastward along Petit Jean Creek until it becomes the Petit Jean River (on the Russellville map).

(vii) Then generally eastward along the Petit Jean River, flowing through Blue Mountain Lake, until the Petit Jean River joins the Arkansas River.

(viii) Then generally eastward along the Arkansas River to Cadron Creek.

(ix) Then generally northward and northeastward along Cadron Creek to the place where it is crossed by U.S. Highway 65.

(x) From there northward along Highway 65 to its intersection with Arkansas Highway 16 near Clinton, Arkansas.

(xi) From there following Highway 16 generally westward to its intersection with Arkansas Highway 23 in Brashears, Arkansas.

(xii) From there southward along Highway 23 to the Madison County-Franklin County line.

(xiii) Then westward and southward along that county line to the Madison County-Crawford County line.

(xiv) Then westward along that county line to the Washington County-Crawford County line.

(xv) Then westward along that county line to Jones Fork (on the Fort Smith map).

(xvi) Then southward along Jones Fork until it joins Frog Bayou near Winfrey, Arkansas.

(xvii) Then generally southward along Frog Bayou, flowing through Lake Shepherd Springs and Lake Fort Smith, to the starting point.