(a) Name. The name of the viticultural area described in this section is ``Potter Valley.''
(b) Approved map. The approved maps for the Potter Valley viticultural area are the U.S.G.S. maps entitled ``Potter Valley Quadrangle, California,'' 1960, and ``Ukiah Quadrangle, California,'' 1958, 15 minute series (topographic).
(c) Boundaries. The Potter Valley viticultural area is located in Mendocino County, California. The boundaries are as follows:
(1) From the beginning point at the southeast corner of quadrant 36 and southwest corner of quadrant 32 (a point where Mendocino and Lake Counties border on the T. 17 N.-T. 16 N. township line), the boundary runs northwest to the northeastern corner of quadrant 4, on the T. 18 N.-T. 17 N. township line;
(2) Then west to the northwest corner of quadrant 1;
(3) Then south to the southwest corner of quadrant 36;
(4) Then east to R. 12 W.-R. 11 W. range line at the southeast corner of quadrant 36;
(5) Then south to Highway 20;
(6) Then southeast on Highway 20 to where Highway 20 passes from quadrant 20 to quadrant 21; and
(7) Thence northeast, returning to the point of beginning. [T.D. ATF-151, 48 FR 46521, Oct. 13, 1983]