Greater Farallones National Marine Sanctuary (Sanctuary) encompasses an area of approximately 2,488 square nautical miles (3,295 square miles) of coastal and ocean waters, and submerged lands thereunder, surrounding the Farallon Islands and Noonday Rock along the northern coast of California. The precise boundary coordinates are listed in appendix A to this subpart.

The western boundary of the Sanctuary extends south from Point 1 approximately 45 nautical miles (52 miles) to Point 2, which is the northwestern corner of Cordell Bank National Marine Sanctuary (CBNMS). The Sanctuary boundary then extends from Point 2 approximately 38 nautical miles (43 miles) east along the northern boundary of CBNMS to Point 3, which is approximately 6 nautical miles (7 miles) west of Bodega Head. From Point 3 the Sanctuary boundary continues south and west to Points 4 through 19 (in numerical sequence) and is coterminous with the eastern boundary of CBNMS. From Point 19 the Sanctuary boundary continues south and east to Points 20 through 25 (in numerical sequence) until it intersects the boundary for Monterey Bay National Marine Sanctuary (MBNMS) at Point 26. From Point 26 the Sanctuary boundary extends eastward and northward, coterminous with MBNMS, to Points 27 through 33 (in numerical sequence). From Point 33 the boundary proceeds along a straight line arc towards Point 34 until it intersects the Mean High Water Line at Rocky Point, California. From this intersection the Sanctuary boundary follows the Mean High Water Line northward until it intersects the boundary for Point Reyes National Seashore approximately 0.7 nautical miles (0.8 miles) south and east of Bolinas Point in Marin County, California. The Sanctuary boundary then approximates the boundary for Point Reyes National Seashore, as established at the time of designation of the Sanctuary, to the intersection of the Point Reyes National Seashore boundary and the Mean High Water Line approximately 0.13 nautical miles (0.15 miles) south and east of Duck Cove in Tomales Bay. The Sanctuary boundary then follows the Mean High Water Line along Tomales Bay and up Lagunitas Creek to the U.S. Highway 1 Bridge. Here the Sanctuary boundary crosses Lagunitas Creek and follows the Mean High Water Line north to the Estero de San Antonio and up the Estero to the tide gate at Valley Ford-Franklin School Road. Here the Sanctuary boundary crosses the Estero de San Antonio and proceeds west and north following the Mean High Water Line to the Estero Americano and up the Estero to the bridge at Valley Ford-Estero Road. Here the Sanctuary boundary crosses the Estero Americano and proceeds west and north following the Mean High Water Line towards Salmon Creek. Approaching Salmon Creek the boundary continues along the Mean High Water Line until it intersects a straight line arc that passes through Points 35 and 36. From that intersection the boundary extends across the creek along the straight line arc towards Point 36 until it again intersects the Mean High Water Line. From this intersection the boundary follows the Mean High Water Line north towards the Russian River. Approaching the Russian River the boundary continues along the Mean High Water Line until it intersects a straight line arc that passes through Points 37 and Point 38. At that intersection the boundary extends across the river along the straight line arc towards Point 38 until it again intersects the Mean High Water Line. From this intersection the boundary follows the Mean High Water Line north towards the Gualala River. Approaching the Gualala River the boundary continues along the Mean High Water Line until it intersects a straight line arc that passes through Points 39 and Point 40. At that intersection the boundary extends across the river along the straight line arc towards Point 40 until it again intersects the Mean High Water Line. From this intersection the boundary follows the Mean High Water Line north to Arena Cove in Mendocino County. Approaching Arena Cove the boundary continues along the Mean High Water Line until it intersects a straight line arc that passes through Points 41 and Point 42. At that intersection the boundary extends across the cove along the straight line arc towards Point 42 until it again intersects the Mean High Water Line. From this intersection the boundary follows the Mean High Water Line north towards the Garcia River. Approaching the Garcia River the boundary continues along the Mean High Water Line until it intersects a straight line arc that passes through Points 43 and Point 44. At that intersection the boundary extends across the river along the straight line arc towards Point 44 until it intersects the Mean High Water Line. The Sanctuary boundary then continues north following the Mean High Water Line until it intersects the rhumb line connecting Point 45 and Point 46. From this intersection the Sanctuary boundary continues west along its northernmost extent to Point 46. The Sanctuary includes Bolinas Lagoon, Estero de San Antonio (to the tide gate at Valley Ford-Franklin School Road) and Estero Americano (to the bridge at Valley Ford-Estero Road), as well as Bodega Bay, but does not include Bodega Harbor, the Salmon Creek Estuary, the Russian River Estuary, the Gualala River Estuary, Arena Cove, or the Garcia River Estuary. Unless otherwise specified, where the Sanctuary boundary crosses a waterway, the Sanctuary excludes this waterway upstream of the crossing.