It runs 41 miles from Colon on the Atlantic to Balboa on the Pacific
The zone consisted of the canal and an area generally 
extending five miles ... running from Panama City on the Pacific coast to the 
Chagres River, where a... [DOC] [TLE] Full text of "Official handbook of the Panama Canal, 1915" [PAR] From Colon, on the Atlantic side of the Isthmus of Pan- ama, to Balboa, on the ...