The San Blas route runs from the bay of the same name on the Atlantic side to the river Chipo which empties in the Gulf of Panama. It is only forty or fifty miles southeast of the Panama route. See Fig. 1, No. 2. The Tehuantepec route begins at the bay of Coatzacoalcos in the Bay of Campeche and ends at the harbor of Salina Cruz in the Gulf of Tehuantepec. See Fig. 1, No. 3. All modern engineers thrust these aside as impracticable, the first two because of the necessity for tunnels and the last because of its great length and number of locks. They will, therefore, receive no further attention. The choice of the location for an Interoceanic canal has long been conceded by practical engineers to lie between the Nicaragua and Panama routes. A consideration of the natural advantages and disadvantages of these rival lines follows. Since the Nicaragua route has been abandoned the features of the proposed construction will receive no attention. It is highly probable that this route would never have been seriously considered by the United States had it not been for the fact that the Panama line was for many years under the control of France and apparently was destined to continue so for a considerable period. Logically the question of harbors first suggests itself. Natural harbors do not exist in Nicaragua nor could one be excavated and maintained on the Atlantic side without a continual battle with forces which, in the last fifty years, have transformed what was once an excellent harbor at Greytown into a lagoon partially enclosed by an ever advancing line of sand brought down by the river San Juan. Experience on the South Atlantic and Gulf coasts of the United States has given abundant evidence of the results of a fight with such forces. In his “The American Isthmus and Interoceanic Canal” W. Henry Hunter says, “The policy which fights against the forces of nature is a mistaken one; it is foredoomed to failure. Nature may be aided in her operations; her more gigantic forces may to some extent be curbed and controlled; but an almost certain Nemesis pursues any effort which may be made to arrest and to determine in an absolute way a process so continuous as that of the filling up of the Greytown bight.” Brito, the Pacific terminus, is little better than Greytown since “even in the calmest weather there is a nearly constant surf, with breakers from four to ten feet high.” Therefore, the terminus at Greytown would always be in danger of being filled up by the Atlantic waves and the one at Brito would constantly be liable to destruction by the Pacific breakers.