Arches are large features added to Terralith version 2.1 based off of real life arches, likes the ones in Utah. They generate in Vanilla Badlands biomes and are made using an inverted spaghetti caves algorithm and noise carvers in a way that makes them solid blocks going from one point to another.
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credit: @StrangerDanger
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Two arches looming over a river
2.1 Added in.