Cobá is located approximately 90 kilometers east of Chichen Itza, and about 40 kilometers west of the Caribbean.

Coba is located around five small lagoons. A series of elevated stone and plaster roads called sacbes radiate from the central site to various smaller sites near and far. Some of these causeways go east to the Caribbean coast, and the longest runs over 100 km to the west to the site of Yaxuna. The site contains several large temple pyramids, the tallest, known as Nohoch Mul, being 42 meters in height.

A number of ancient raised pedestrial highways, called 'sacbeob', radiate out from Coba to other Maya sites in the area, the longest of these being over 100 kilometers long. This roadway runs west to the site of Yaxuna.

In its heyday, Cobá probably held approximately 50 thousand people or more. The city proper extened to 80 square kilometers. It had a significant population by the first century AD, although the major population growth occurred during the period 500 - 900 AD. Although growth slowed down after this timepoint, temples continued to be constructed up until the 14th century.

Nohoch Mul is a notable, albeit somewhat ruined, pyramid at this location. It stands 140 feet tall, and its style is more to that of Tikal than that of Chichen Itza. There are seven levels to this structure, and an auxilliary temple at its base.




References:

http://en.wikipedia.org/wiki/Coba

http://www.jonbales.com/yucatan/Coba/NohochMul.htm