Question: For what is the mountain that has Thayer Glacier on the east slopes popular ? 
Sentence (from "Zhenda Glacier"): Zhenda Glacier (Bulgarian: "ледник Женда" , ‘Lednik Zhenda’ \'led-nik 'zhen-da\) is the 8 km long and 4.8 km wide glacier on the east side of the main crest of northern Sentinel Range in Ellsworth Mountains, Antarctica.
Relevant evidence: No