I installed the 1.18 Experimental Snapshot 7 and loaded a new world. I wanted to elytra around because they changed the speed. I randomly came across this amazing spectacle.
Anyway, this seed contains a micro shattered savanna biome inside a taiga biome which includes a cool waterfall, a floating island right next to an ocean and a cold ocean biome. On top of this, there is an ocean cave filled with water really close by that goes all the way down to -40 and possibly lower.