Iron Kingdoms: A New Start
Once a year all three moons of Western Immoren line up to cause extreme tides that vacillate from extremely high to exceptionally low twice a day. Certain caves and coves are only accessible during this time. For two days the waters are so unruly and levels change so radically that boating in the channels is all but impossible. For this reason, every sailor is landlocked and this provides an excuse for gambling, drinking, whoring and fighting.