| Ancón de Sardinas | |
| Location: | Colombia–Ecuador border |
| Coords: | 1.4669°N -78.98°W |
| Oceans: | Pacific Ocean |
| Countries: | Colombia, Ecuador |
| Pushpin Map: | Colombia |
Ancón de Sardinas ('Sardinas Bight') is a bight in the Pacific Ocean, located on the border between Colombia, which is to the north (Nariño Department), and Ecuador, which is to the south (Esmeraldas Province).[1] In this place begins the maritime delimitation of the border between Colombia and Ecuador, which consists of a single treaty signed on August 23, 1975[2] and, from the intersection of the extension of the land border and the confluence of the territorial areas of both countries, a midpoint is marked in the bay; From here to the Mataje River, which flows into it, a line is drawn that terminates the boundary.[3]