Conversation so far:
what is the tallest mountain range in the us
The Alaska Range is the tallest mountain range in the US.
where is the alaska range located
The Alaska Mountain Range is located in the southcentral region of the U.S. state of Alaska.
what is the tallest mountain in the alaska range
Denali is the highest mountain peak in North America and is part of the Alaska Mountain Range.

Question: how tall is the mountain
Self-contained rewrite: how tall is mt. denali