There's been a fair number of previous posts which cover that topic: https://www.google.com/search?q=news.ycombinator.com+procedural+terrain+generation+river+f

There's been a fair number of previous posts which cover that topic: https://www.google.com/search?q=news.ycombinator.com+procedural+terrain+generation+river+flow+geology https://www.google.com/search?q=news.ycombinator.com+procedu... This one is a particularly useful starting point: https://news.ycombinator.com/item?id=5196154 https://news.ycombinator.com/item?id=5196154