The hard choice

Redsand was a city that's neither here, nor there. 

It exists solely because the ships can't sail forever without resupplying. 

Simply put, the Red Death desert is too big and too long. Thus, the sea trade route has always been the most convenient way to go from north to south in the Drakon empire. 

On top of that, the sea is relatively calm and predictable on the western coast of the dragon empire. 

The storms came like clock work, as did the northerly and southerly wind. The channels are interspersed just at the right places. As long as a person wants to get off, they could stop anywhere on the long coast line, given most of it is gentle mud flats. 

Thus, Red Sand city, the most important stop, has been built at about twenty five days of sea journey from Praha to the south. 

The ships from Red Sand go north or south, so much so, the wharf is clearly divided in a manner that southern ships will not touch the northern ships.