Which of the following is a true statement about the Yucatan Peninsula?

The Yucatán Peninsula is known for its unique geological features, including a number of large sinkholes, known as "cenotes." These cenotes are formed by the collapse of limestone bedrock that exposes groundwater underneath, creating natural swimming holes and adding to the region's scenic beauty. The presence of these sinkholes is significant because they were historically important to the indigenous Maya civilization for water sources and are still popular for recreation and tourism today.

In contrast, the other options are not accurate representations of the Yucatán Peninsula. For instance, it is not densely populated relative to other areas; its population density is lower due to large expanses of rural and undeveloped land. While the peninsula does have some hilly areas, it is generally flat and not more mountainous than other parts of Mexico, which has substantial mountain ranges. Additionally, while the Yucatán was primarily inhabited by the Maya civilization, as opposed to the Aztecs, which were located in a different region of Mexico, leading to the misconception that it was Aztec territory.