I've been working with maps about 60km in diameter, offset depends on your minimum elevation, and Deformity on the difference between the highest and lowest elevations. if you are near the coast you want to sink it a few dozen meters below sea level.  If you want to get some OK resolution height maps of actual places on Earth check out https://terrain.party/ . It was made for some other game I've never played but works great for this. The resolution varies in different parts of the world (U
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