Aulin

The Floating City

Aulin, also known as “The Floating City,” is a major tourist spot in the Fairre Plains. Located in the middle of a massive crater, Aulin’s coastal location allows it to fill/flood during high tide. After which, all of the water magically drains. The city floats thanks to its small individual buoyant platforms. The water magically fills to the same elevation everyday by morning, and sinks as the day progresses.

Industry

Aulin's large population is supported by two things. For one, it's coastal location makes it a great trade city. While it is difficult to get ships in an out of the main tidepool, there is also a grounded portion of the city that features its own port. Many people will try and sell their home-made wares here, allowing a lot of small industries to form. This also makes Aulin a neat tourist spot, as if the advent of a floating city wasn't enough.
The other thing keeping Aulin afloat (literally), is the cave entrance at the bottom of the crater. Aulin's cave is rumored to be infinite and regenerative. Cave delvers can go the same route every night in the caves and still get different loot every night. The water does make this a nasty gamble, as there is only a 15 minute window where the water is completely emptied out. Cave delvers have found specific wings of the cave that don't flood overnight, so they typically take 24 hour trips through the caves.
This "go big or go home" mentality has made quite the saying around Aulin. "In Aulin, you're either all in or you're out." If you want to make a profit in The Floating City, you need to be willing to put everything on the line. That includes your life. The work culture in Aulin is intense, not just in mining, but in everything.
One last thing: Fishing. The fact that Aulin completely empties out every night makes fishing really easy. During low tide, all the fisherman have to do is walk along the crater. Fish always get stuck on the rocky terrain. Then, all they have to do is pick up the fish and go home.