Sistema Sac Actun

Sistema Sac Actun
Map showing the location of Sistema Sac Actun
Map showing the location of Sistema Sac Actun
Sistema Sac Actun
Location in Mexico
LocationTulum Municipality, Quintana Roo, Mexico
Coordinates20°14′47.6″N 87°27′50.8″W / 20.246556°N 87.464111°W / 20.246556; -87.464111
Depth119.2 meters (391 ft)[1]
LengthUnderwater: 378.56 km (235.23 mi)[1]
Total: 386.122 km (239.925 mi)[2]
DiscoveryNovember 26, 1987
GeologyLimestone
Entrances228 Cenotes[1]
DifficultyAdvanced cave diving

Sistema Sac Actun (Yucatec Maya: sak aktun, lit.'white cave', Spanish: sistema, lit.'system') is an underwater cave system situated along the Caribbean coast of the Yucatán Peninsula with passages to the north and west of the city of Tulum. Discovery of a connection to Sistema Dos Ojos in 2018 made it the longest known underwater cave system. As of January 2023, it is the second longest underwater cave system in the world, only surpassed by Sistema Ox Bel Ha.

The remains of a mastodon and a human female that might be the oldest evidence of human habitation in the Americas have been found in the cave.

  1. ^ a b c "List of Long Underwater Caves in Quintana Roo Mexico". Quintana Roo Speleological Survey. National Speleological Society (NSS). January 10, 2023. Retrieved 10 January 2023.
  2. ^ "Dry Caves and Sumps of Quintana Roo Mexico". Quintana Roo Speleological Survey. National Speleological Society. January 10, 2023. Retrieved 10 January 2023.