Sucumbíos is a province in northeast Ecuador. The capital and largest city is Nueva Loja (normally referred to as Lago Agrio). It is the fifth largest province in the country, with an area of 18,084 km2. In 2010, it had a population of 176,472 inhabitants.
Sucumbíos is bounded on the north by Colombia, on the south by Napo and Orellana, on the west by Carchi and Imbabura, on the southwest by Pichincha, and on the east by Peru. Sucumbíos is the only province in Ecuador that borders two different countries.
The province is one of the six provinces in the Amazon Region, a natural region of Ecuador.
