As you can see in the screenshots below, the first is from neighboring Birchwood. Normally all regions on Corsica have these 512x512 terrain textures.
For some reason all the terrain textures in New Bloom Mountain are 128x128 ever since it was built, this is why the terrain is extremely low resolution here. (This is 16 times lower resolution than everywhere else.) This can be seen in the third screenshot with the corner of New Bloom Mountain between Birchwood and Jessgate.
Needless to say, the entire mountain would look much better with the 512px textures.

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