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Results found in several dictionaries: Collins, Collaborative Dictionary
Cono Sur   sm 
 (Pol) 
Argentina, Chile and Uruguay, Southern Cone

Collaborative Dictionary     Spanish-English
islas georgia del sur y sandwich del sur nmpl. South Georgia and South Sandwich Islands Reverso General Dictionary 
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'cono sur' also found in translations in English-Spanish dictionary
South Georgia and South Sandwich Islands n. las Islas Georgia del Sur y Sandwich del Sur Reverso General Dictionary 
South Vietnamese n. el vietnamita del sur Reverso General Dictionary 

"Collins Spanish Dictionary 8th edition published in 2005 © William Collins Sons & Co Ltd 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005"