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Several of them. Two of them are the Mexico City Valley in central Mexico, or the Guadalupe Valley, in Baja California.
There are several of them, but the most famous is the Valley of Mexico, where Mexico City resides.
Yes, it is.
The Aztec Empire was located in Mexico- the Valley of Mexico to be exact. The capital, Tenochtitlan, was built on raised islets in Lake Texcoco.
California
The capitol of Mexico, Mexico City, is located in the Valley of Mexico. It is located in the high plateaus of South Central Mexico.
The Aztecs lived in Central Mexico. Specifically, in the Valley of Mexico around Lake Texcoco.
The Texcoco valley, in the Mexican Central Plateau.
The "Mexican Valley" or "Valle de Mexico" is what is called the area where Mexico City (19°25'57.85''N 99°07'59.71''W) is located.
The Mexican Central Plateau or Mexican Altiplano. It is where most people is agglomerated.
I believe it is the Tlapacoya Volcano
800 - 1000 AD