The Snowfall of Irasosia
The river Iir winds through the lands of Irasosia until it reaches the Heights of Winter as it tumbles over the lip, it freezes into snowflake, floating down the hundred or so feet as beautiful clouds of snow. It piles at the bottom is massive drifts.
As if this snowfall was not usual enough, the snow formed of Iir water does not melt until it comes into contact with fire or liquid. This allows the snow to be stored and transported. The Irasosia Snow Company packages snow in casks and barrels which are in turned shipped all across the Sea of Stars. Naturally, casks of Iir Snow are considered to be a luxury item in many places.
A few years ago, when the water falling over the Heights of Winter failed to turn to snow for almost half an hour. The workers were thrown into a brief panic, and several injuries were caused, and production (filling) of snow casks and barrels fell behind a full two weeks.
The brief interruption in the snowfall was inadvertently caused by a group of adventurers, but this is not widely known.