You're traveling across flat plateau lands and then all of a sudden the canyon just opens up before you.

你正在高原平坦地带走着，突然间峡谷就在你眼前冒了出来。

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The U. S. Congress named the lands below the canyon rim a Wilderness Preservation System. This is meant to "protect forever the land's natural conditions. ""

美国国会认定该峡谷边缘以下的陆地为一处荒野保护体系。这是为了永久保护这片土地的自然条件。

youdao

The Havasupai used to roam freely between the canyon where in summer they grow vegetables, corn and grass for their horses and their plateau lands, where they once hunted elk and gathered berries.

ECONOMIST: Indian tribes