Translation:The mountain is high.
Is this equivalent to "The mountain is tall"? Or does it mean the mountain is at high elevation? Rephrased, could you use "학교가 높습니다" to describe a one-story school on a mountain? Or does it mean the building itself is tall?
I was also wondering the same thing. One of the other statements in this lesson is "the road is high" using this same "높습니다 ," so given that context I infer that it really does deal with elevation (since obviously, a road can't be tall.