Where did the Aztec Indians live?

The Aztec Indians inhabited the central region of today's current country of Mexico. Many different groups and regions surrounding the Valley of Mexico can be encompassed in the Aztec definition, however Aztecs are more commonly considered to be the residents who made Tenochtilan, the capital of the empire, their home. Tenochtilan was a city situated on an island in the middle of lake Texococo. The ancient city is now the location of modern day Cuidad de Mexico, or Mexico City in the south central region of the country.