Aguarico

The Aguarico River (Spanish for "rich water") is a river in northern Ecuador. It is the principal river of the province of Sucumbos. It is the Ecuadorian-Peruvian boundary at the end of its path. It discharges into the Napo River. It is 390 kilometers (240 miles) long, with the last 50 kilometers (31 miles) running along the natural border between Ecuador and Peru (in the department of Loreto). According to The Rio de Janeiro Protocol of 1942, the lower course of the Aguarico River was resolved and legally fixed as part of the long-disputed Ecuador-Peru border. Ecuador unilaterally rejected the protocol in 1960, but a new agreement recognizing the pre-existing protocol was signed in 1999.

As one of the longest rivers in Ecuador, the Aguarico River runs almost entirely through the province of Sucumbos in northern Ecuador and is the province's primary river. It flows close to the Reserve of Production Faunstica Cuyabeno on average. It runs along the Ecuadorian-Peruvian border in the final stretch of its journey. Finally, it comes to an end at the Napo River, on the same boundary, a little over the town of Pantoja in Loreto, Peru.

Length: 242 miles