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How far did the Inca Empire extend at its greatest size?

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Map showing principal sites of Meso-American civilization, with the Mayan zone of influence shaded in green across southeastern Mexico, Guatemala, Belize, and parts of Honduras and El Salvador. The map highlights major Mayan, Aztec, and other ancient sites, as well as the extent of the Aztec Empire in central Mexico, using color-coded symbols and labels for notable cities and archaeological locations. — Pre-Columbian civilizations Principal sites of Mesoamerican civilization.

At its greatest size, the Inca Empire stretched along the Pacific coast and the Andean highlands for more than 2,500 miles (4,000 km).12

The empire's boundaries reached from the Ancasmayo River—the modern border between Ecuador and Colombia—in the north, to the Maule River in central Chile in the south. At this peak, the territory encompassed approximately 380,000 square miles (985,000 sq km), a landmass comparable in size to France, Belgium, the Netherlands, Luxembourg, Switzerland, and Italy combined.123