The following geographic areas in §B—G of this regulation designate zones within each ORA for specific management actions. Chester River. Zone A is upstream from a line which runs from Lat. 39°06'31.6", Long. 76°07'06.8" southeast from Deep Point across the river to Lat. 39°06'11.5", Long. 76°06'48.8" east of Spaniard Point. Zone B is upstream from a line connecting Spaniard Point at Lat. 39°05'33.2", Long. 76°08'43.8" with the other side of the river in a northwest direction to Lat. 39°06'16.0", Long. 76°09'37.1" up to the boundary of Zone A. Zone C is downstream from the lower boundary of Zone B to the mouth of the river defined by a line from Love Point to the northwest tip of Eastern Neck Island. Choptank River. Zone A is upstream from just south of Jamaica Point at Lat. 38°36'38.6", Long. 75°59'09.8" across to the southern edge of the mouth of the Warwick River at Lat. 38°36'19.8", Long. 75°58'36.0". Zone B is downstream approximately 4,000 yards from the boundary of Zone A to Lat. 38°34'36.6", Long. 76°00'23.5" across the river to Lat. 38°35'20.3", Long. 76°01'15.0". Zone C is downstream from the lower boundary of Zone B to the mouth of the Choptank River. Severn River. Zone A is downstream from the Route 50 bridge and upstream from the Maryland Department of Environment's restricted line. Zone B is upstream from the Route 50 bridge. Magothy River. Zone B encompasses all of the area upstream of a line from Chest Neck Point, Lat. 39°04'17.55", Long. 76°30'08.29" to South Ferry Point, Lat. 39°04'42.56", Long. 76°29'32.54". Zone C encompasses the area downstream of a line from Chest Neck Point to South Ferry Point to the mouth of the river. Nanticoke River. Zone B is an area upstream of a line from the southern shore of the mouth of Lower Greens Cove, Lat. 38°20'28.34", Long. 75°54'47.60" to Hatcrown Point, Lat. 38°19'44.70", Long. 75°52'56.68". Zone C is an area downstream of a line from the southern shore of the mouth of Lower Greens Cove to Hatcrown Point. Patuxent River. Zone B is upstream of a line from Holland Point, Lat. 38°30'28.71", Long. 76°39'57.57" to the west shore of the river, Lat. 38°30'27.63", Long. 76°40'42.78". Zone C is downstream of a line from Holland Point to the west shore of the river.