The Boise meridian is one of the 35 principal meridians of the Public Land Survey System of the United States. Adopted in 1867, its longitude is 116° 23′ 35″ (or 116° 24′ 15″) west from Greenwich and its principal baseline is latitude 43° 22′ 21″ north. The meridian and baseline intersect approximately 19 miles (31 km) from Boise, between the Snake River and the Boise River.