Question: What is a large mountain massif in Antarctica that is 21 km long and 13 km wide and lies within the Sentinel Range of the Ellsworth Mountains, named after  a United States Representative from Georgia ?
Sentence (from "Vinson Massif"): Vinson Massif ( ) is a large mountain massif in Antarctica that is 21 km long and 13 km wide and lies within the Sentinel Range of the Ellsworth Mountains.
Relevant evidence: Yes