Putumayo

The Putumayo River constitutes a portion of Colombia's boundary with Ecuador as well as the majority of its border with Peru. In the previous three countries, it is known as the Putumayo, but when it enters Brazil, it is known as the Içá. The Putumayo River rises in the Andes Mountains east of Pasto, Colombia. It flows into the Solimes (upper Amazon) near the Brazilian town of Santo Antônio do Içá. The Guamués, San Miguel, Güepp, Cumpuya, Algodón, Igara-Paraná, Yaguas, Cotuhé, and Paraná de Jacurapá rivers are major tributaries. The river passes through the ecoregion of Solimes-Japurá damp woods.

Putumayo is one of the longest rivers in Ecuador and also is one of the Amazon River's tributaries. It is a section of the Ecuador-Colombia border as well as a border with Peru. Putumayo flows over 1,000 miles from the Andes Mountains in Columbia to the Amazon River in Brazil. During the Amazon rubber boom of the nineteenth century, the terrain near Putumayo was utilized for rubber manufacturing. The Putumayo River is now an important transportation corridor, with boats able to travel the whole length of the river. Cattle farming is another important activity along the Putumayo River's banks.