Final answer:
The Mayan civilization thrived in the modern-day territories of Mexico, Belize, Guatemala, and Honduras, leaving behind archaeological sites and evidence of their advanced culture.
Step-by-step explanation:
The ancient Mayan civilization flourished in four modern-day countries: Mexico, Belize, Guatemala, and Honduras. This Mesoamerican culture left behind a remarkable legacy, including sophisticated flat-top pyramids, advanced mathematical systems, and majestic garden cities, amidst the lush Central American jungles. The classical era of the Mayan civilization, from around 250 to 900 CE, saw the construction of grand city-states such as Copan, Tikal, and Chichen Itza, which are now precious archaeological sites attracting visitors worldwide. The contributions of the Maya to architecture and mathematics were significant, and their complex societies were supported by agriculture, trade, and a pantheon of deities, evident through the stunning ruins and artifacts that remain today.