This region
possesses the highest number of biodiversity surrogates (species and
ecosystem types) and conservation targets. The Central Highlands region
includes the Trans-Mexican Volcanic Belt, an areawith complex topography
that contains the largest amount of mountain valleys and
associated lakes; this is the region with largest number of lakes in
Mexico. In contrast, the Yucatan Peninsula lacks surface drainage and
has few lagoons, but it possesses the largest number of dissolution
lakes, called cenotes, which are present across the entire peninsula