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plural buttes
(US) An isolated hill with steep sides and a flat top. quotations examples
Those multitoned buttes and mesas [of the Grand Canyon], and that incandescent sequence of colorful bands that make one of the natural wonders of the world so grand, can also be found over 100 million miles away [on Mars].
2013 November 27, John Grotzinger, “The world of Mars”, in The New York Times