Extreme Hills (Forge)

Extreme Hills is a Forge Biome Category that contains by default the following biomes:

Vanilla Biomes

Biome	Biome ID
Gravelly Mountains	minecraft:gravelly_mountains
Gravelly Mountains+	minecraft:modified_gravelly_mountains
Mountain Edge	minecraft:mountain_edge
Mountains	minecraft:mountains
Wooded Mountains	minecraft:wooded_mountains

Biomes You'll Go Biomes

Biome	Biome ID
Alpine Foothills	byg:alpine_foothills
Bluff Peaks	byg:bluff_peaks
Bluff Steeps	byg:bluff_steeps
Dover Mountains	byg:dover_mountains
Skyris Highlands	byg:skirys_highlands
Skyris Highlands Clearing	byg:skirys_highlands_clearing
Skyris Peaks	byg:skirys_peaks
Skyris Steeps	byg:skirys_steeps

Biomes O' Plenty Biomes

Biome	Biome ID
Highland	biomesoplenty:highland
Highland Crag	biomesoplenty:highland_crag