A great look at how Unexplored 2: The Wayfarer's Legacy uses Voronoi graphs to create more natural and realistic looking generated maps:

https://www.gamedev.net/articles/programming/general-and-gameplay-programming/tiles-to-curves-fun-with-voronoi-graphs-part-1-r5150/

Tiles to Curves: Fun With Voronoi Graphs (part 1)

This is a blog about our development of Unexplored 2: The Wayfarers Legacy. This game features state-of-the-art content generation, generative storytelling, emergent gameplay, adaptive music, and a vibrant art style. The content generator of Unexplored 2 generates tile maps. Typical output looks ...