Coba is a big ruined city of the Maya civilization. It is estimated to have had around 50,000 inhabitants at its peak of civilisation and the built up area extends over 80 km². Coba is an undeveloped archaeological site deep in the Yucatan jungle, it still has 5000 mounds yet to be uncovered! It is surrounded by four natural lakes, which are believed to have given the city its name, which means "waters stirred by wind". Archaeologists are convinced that, in time, it will prove to be one of the largest Maya excavations on the Yucatan Peninsula. This is a special site because it is one of the only Maya temples, which are still allowed to be climbed.