Originally posted by Bioshocked ツ:

Unsure if the terrain generation is meant to be this way, but I have noticed that the Mistlands don't contain many large patches of land to traverse properly on.

There are separate "regions" generated within the biome, not unlike how plains or meadows have forests and fields and the like. In mistlands the splintered coastline probably presents the biggest navigational challenge, but there are also "normal" regions as well as valleys that are entirely free of mist which should appear in darker hues on your map.