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Gilbert Glacier ( ) is a glacier about 20 nautical miles ( 37 km ) long flowing south from Nichols Snowfield into Mozart Ice Piedmont , situated in northern Alexander Island , Antarctica .
 Gilbert, Antarctica
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gilbert, Antarctica