Yucatan Peninsula

The Yucatan Peninsula juts north from the Central American landmass into a narrow seam between the Gulf of Mexico to the west and the Caribbean Sea to the east. Geologically it is almost entirely limestone — flat, porous, and honeycombed below the surface with the cenote network and underground river systems that made the peninsula habitable for the Maya long before the coast was ever the attraction. The Caribbean face, running from Cancún south through the Riviera Maya and down to Tulum, is microtidal in the strict sense: mean tidal range of 0.2 to 0.3 metres, with spring tides occasionally reaching 0.4 metres. In practical terms the tide is not a planning variable for most coastal activities here. The Caribbean tidal signal is suppressed by the basin geometry — the semi-enclosed nature of the Caribbean Sea and the multiple island arc barriers to the east limit the open-ocean tidal forcing that drives the large ranges of Atlantic and Pacific coasts. What does govern the coastal environment on the Yucatan Caribbean face is wind, hurricane track, and the Yucatan Current — the warm, northward-flowing current that feeds into the Gulf Stream and keeps water temperatures in the 27–30 °C range year-round. The offshore reef system, part of the Mesoamerican Reef, is the second-longest barrier reef in the world, running parallel to the coast and creating a calmer inner lagoon zone between reef and beach. Nichupté Lagoon at Cancún, behind the Hotel Zone sandspit, has essentially no tidal exchange with the open Caribbean — its water level is driven almost entirely by rainfall, evaporation, and occasional storm surge rather than the astronomical tide. The cenotes inland are fully decoupled from ocean tides; their water levels reflect the regional karst water table and vary seasonally with rainfall, not with the Moon's position. Hurricane season, June through November, is the dominant forcing event for the Yucatan coast — storm surge from a direct hit can raise water levels several metres above normal, overwhelming any astronomical tide consideration by an order of magnitude. Sargassum influx, driven by offshore current patterns, has become a recurrent seasonal condition on the Caribbean face from approximately March through August, with intensity varying year to year.