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"): In 1961, the Vinson Massif was named by the Advisory Committee on Antarctic Names (US-ACAN), for Carl G. Vinson, United States congressman from the state of Georgia, for his support for Antarctic exploration.
Relevant evidence: No