Overworld Valley

Since goats, better mountains, and snowier snow will come in 1.17 why not add to that "better mountains generation" by adding valley to the overworld.

Rather than a dead and very dangerous place like the soulsand valley the overworld valley (or just "Valley") is a calm place where goats, cows, sheeps, and just animals in general will spawn 1/2 or 2 times more frequent than the normal plains biome, so the biome is great for start a base and builds in general!

the valley will spawn a bit rarer as the soulsand valley (to make them a bit more unique). The generation will be like their real world counter part, surrounded by mountains! The Valley it self will be the land surrounded by the mountains. The ore generated here is like the Extreme Hills, so emeralds can spawn

there will be 3 types of Valley, a normal Valley, Desserted_Valley, and Extreme_Valley. the Valley will spawn in normall grassy / or mountany biome, Ds.Valley will spawn in messa-y (but will not spawn animals because of it's desserted state), and the Xt.Valley will spawn in Savana-y biome