Quintana Roo Speleological Survey

The Quintana Roo Speleological Survey (QRSS) was established in 1990 for the safe exploration, survey and cartography of the underwater and dry caves and cenotes of Quintana Roo, Mexico, supported by the National Speleological Society. The survey principally acts as a data repository for explored sites within the state of Quintana Roo and distributes summary statistical tables through its webpage, which as of January, 2025 included 412 underwater cave systems with a total surveyed length of 1,736.7 kilometers (1,079.1 mi), and 153 caves above the water table with a total length of 359.7 kilometers (223.5 mi).

Source: Wikipedia — Quintana Roo Speleological Survey (CC BY-SA 4.0)