general idea could be that each region has a specific type of biome it generates as, and the entire region changes how it generates that biome based on what biomes surrounds the chunk. this would make it super easy to always have the player spawn on a beach. it would also make for some kinda interesting worldgen patterns because all the biomes would have square-ish patterns.
the player shoudl somehow start with one of these chunk discovery tokens so that they know they exist and dont get stuck in the spawn region the entire time.