Tide

The tides of glorantha are associated with the Blue Moon


 * When the Blue Moon is in the Sky the waters are high
 * When the Blue Moon is in the Underworld, the waters are low.
 * The tides obey an erratic cycle in which the water levels slowly rise before plunging precipitously.
 * The slow rise occurs when the moon rises from the underworld to the sky on the Sky Dome
 * When the moon falls from the Pole Star through Magasta's Pool back into the Underworld, the water levels slump.
 * People who investigate the tides include:
 * The Wizards of Fliswal in Umathela
 * The Master of Tides in the Maslo Coast

Source: Guide to Glorantha