Rivers are, next to mountains, the most important factors in the physical aspect of the land; and in Central America they are abundant, though, from the broken nature of the country, not of great size. From the position of the backbone of the land, most of the watershed is towards the Gulf of Mexico and the Caribbean Sea; even the great lakes of Nicaragua, which are really on the Pacific side, empty through the Rio San Juan into the Atlantic, the river taking advantage of a break in the cordillera. The lower or navigable portion of the Central American rivers is the only part known; the sources of even the largest streams are still unexplored. So tortuous are the courses that names are multiplied, and rivers that flow from inhabited valleys through wild forests again appear in the lowlands as unknown strangers; and the river that one traveller describes as important and navigable, because he sees it in the season of rain, the next visitor may cross knee-deep, and know only as a brook. On the Pacific side may be mentioned the Rio Lempa, which rises near Esquipulas, receives the waters of the considerable Lago de Guija (on the boundary of Guatemala and Salvador), and even after the dry season is of large volume, thirty miles from its mouth attaining a breadth of more than six hundred feet and a depth of ten feet, which is nearly twenty-seven when the floods of the rainy season occur. If it were not for the bar, which has hardly a fathom of water, the navigation would develop rich lands on either bank. The Rio Paz, the Rio de los Esclavos, and the Rio Michatoya are not navigable, although formerly the latter stream at its mouth (Istapa) was large enough within the bar to admit the construction of vessels of moderate size; it was here that the Spaniards fitted out several fleets. Far different are some of the rivers that find their way into the Atlantic. Chief among them all is the noble Usumacinta, which flows into the Gulf of Mexico through the Lago de Terminos, and is navigable many miles through a singularly fertile and interesting country, as beautiful as fancy pictures the cradle of the human race,—a land seldom visited by white men, and the home of the unconquered and unbaptized (La Candones) Indios. The swift Chixoy, the Rio de la Pasion, and the almost unknown San Pedro unite to form this “Child of many Waters.”