(a) Name. The name of the viticultural area described in this section is ``Napa Valley.''
(b) Approved maps. The maps showing the boundaries of the Napa Valley viticultural area are the:
(1) ``Mt. St. Helena'' U.S.G.S. 7.5 minute quadrangle;
(2) ``Detert Reservoir'' U.S.G.S. 7.5 minute quadrangle;
(3) ``St. Helena'' U.S.G.S. 15 minute quadrangle;
(4) ``Jericho Valley'' U.S.G.S. 7.5 minute quadrangle;
(5) ``Lake Berryessa'' U.S.G.S. 15 minute quadrangle;
(6) ``Mt. Vaca'' U.S.G.S. 15 minute quadrangle;
(7) ``Cordelia'' U.S.G.S. 7.5 minute quadrangle;
(8) ``Cuttings Wharf'' U.S.G.S. 7.5 minute quadrangle; and
(9) Appropriate Napa County tax assessor's maps showing the Napa County-Sonoma County line.
(c) Boundaries. The Napa Valley viticultural area is located within Napa County, California. From the beginning point at the conjuction of the Napa County-Sonoma County line and the Napa County-Lake County line, the boundary runs along--
(1) The Napa County-Lake County line;
(2) Putah Creek and the western and southern shores of Lake Berryessa;
(3) The Napa County-Solano County line; and
(4) The Napa County-Sonoma County line to the beginning point. [T.D. ATF-79, 46 FR 9063, Jan. 28, 1981, as amended by T.D. ATF-201, 50 FR 12533, Mar. 29, 1985]