Guanaja is covered with forest, and about 90 % of the island have been declared National Trust Area.
The island is surrounded by several kilometres of coral reef, and several sunken ships are situated in the sea outside of the Guanaja island.
The listing which appears here is necessarily incomplete, however it contains notable sites drawn from several large and ongoing surveys, such as the Corpus of Maya Hieroglyphic Inscriptions (CMHI) and other sources (see References).
Maya sites which are known to have been among the largest and most influential polities through the various eras of Maya history —Formative (or Preclassic), Classic and Postclassic— and/or which have left the most impressive archaeological remains include: Becan was a major city in the Yucatán Peninsula.
Calakmul was one of the two most important Maya cities in the Classic Period, when its rivalry with Tikal dominated the Maya political landscape.