Southernmost

S1: Absolute southernmost point is in San Francisco Bay, 37°37’55.5″N 122°13’05.7″W (37.632075, -122.218243)

S2a: Southernmost point on land is the southern tip of South Field, Runway 30, 37.699198405885205, -122.21406110929988; Elevation: 0 (runway elevation: 9 ft.)
S2b: Southernmost publicly accessible point over land is in the back of an airplane using Runway 30; the last row, window seat “A” is the southernmost at the start of takeoff

S3a: Southernmost publicly accessible in a building is the far left corner at the end of Terminal 2, opposite the door for Gate 32, 37.70873948196186, -122.21307354601917

S3b: Southernmost publicly accessible via public streets is along Edward White Way, southeast of Terminal 2, 37.71006491345869, -122.21122691071037 (Edward White was one of the Apollo 1 astronauts who died January 27, 1967 in a launch pad fire)




There are no signs and nothing to prevent you from going southward beyond the staff parking and dumpsters to the actual staffed security gate but, the guard that day told me I was only allowed as far as an earlier, disused guard kiosk (visible above); putting me at 37.71119143768023, -122.21011890805227.