From Puntarenas southward to the unnavigable Barranca River there is a broad beach lying at the foot of the high escarpment of Caldera.
The Rio Grande de Tarcoles, which enters the gulf south of the Barranca, has a dangerous bar, but once inside it may be navigated a few miles. Its upper waters irrigate the table-land of San José, Alajuela and Heredia. In the neighborhood of these towns is garnered nearly the entire coffee crop of Costa Rica. The coast line south is rocky and precipitous until near Punta Mala, or Judas, at the southeastern mouth of the gulf, and is low and surrounded by reefs and rocks.
From Point Judas, low and covered with mangrove swamps, the coast trends southeast in a long angular curve for about one hundred marine miles to Point Llorena. It is dominated by lofty hills, cut through at intervals by short impetuous streams and a few estuaries. The only safe and excellent anchorage in this one hundred miles is Uvita Bay, behind a rocky reef. From the precipitous headline, called Punta Llorena, to Burica Point, the southern limit of Costa Rica, the coast is abrupt, soon rising into ridges and peaks from 300 to 700 meters high (985 to 2300 feet). These give birth to a few short turbulent streams. About half way between these two points the great Golfo Dulce, having a main width of six miles, penetrates inland northwest about twenty-eight miles. It has an average depth of one hundred fathoms.
Cape Matapalo, which marks its western entrance, is deep and forest-covered, but Banco Point, opposite to it, is low. At the head of the gulf is found the little Bay of Rincon. From here to the Esquinas River, at the northeast angle of the gulf, the shore is hilly, and thence to the harbor of Golfito, which is surrounded by high hills, the country rises rapidly inland, but between Golfito and the entrance to the gulf it is lower and less broken, and thence to Platanal Point and Burica Point, the coast is bold, the country descending gradually from the northeast.
From Point Llorena to Point Burica the coast is wild and almost uninhabited. The coasts of Golfo Dulce have but a few hundred half-breeds as their sole occupants.
There are but two rivers in the long coast line from the Gulf of Nicoya to the Golfo Dulce, the Rio Grande de Pirris, and the Rio Grande de Terraba, the head waters of the former flowing through deep canyons with steep sides, which are almost bare of vegetation until the region of Guaitil is reached, where dense forests are encountered. The valley of the Rio Grande de Terraba is one of the most beautiful, extensive and fertile of Costa Rica, but is occupied by only a few families. Formerly it was the home of a large indigenous population.
In the angle made by the River Buena Vista and Chirripo there is a vast ancient cemetery, the graves of which contain many ornaments of gold, principally eagles. An ancient road runs by near this place.
Turning to the hydrographic basin of the San Juan River and Lake Nicaragua, the northeastern slope of the Miravalles range is found to send off several small streams to the lake.
Between Cuajiniquil, two and one-fourth miles east of Rio Sapoa, and Tortuga, six miles further east, are the little streams, Lapita, El Cangrejo, Puente de Piedra, La Vivora, Guabo, Genizaro and Tortuga, the latter the greatest in volume, being about one hundred and sixty feet wide at its mouth and navigable. In the further distance of seventeen miles going east, we cross the rivers Zavalos, Cañitas, Quesera, Mena, Mico, Sapotillo, Quijada, Quijadita, Santa Barbara, Sardinia, Barreal, Cañas, Perrito and, finally, Las Haciendas which is navigable by small boats. From here to San Carlos, at the outlet of Lake Nicaragua, the distance is sixty-four kilometers, and the principal rivers which cross this tract are El Pizote, Papalusco, Guacolito, Zapote, Caño Negro and Rio Frio. The Rio Frio is of considerable magnitude, and with its many branches drains a large area of the territory lying on the slopes of the volcanoes of Miravalles and Tenorio. It pours much sedimentary matter into Lake Nicaragua, and has thrown an extensive mudbank across the lake entrance to the River San Juan.
For three or four miles above the mouth of the River Frio the lands are low and swampy. Several of its branches can be reached and navigated by canoe, and even a small river steamer can ascend a few miles from the lake.