77122
The term " Karst topography " refers to that of southwestern Slovenia 's Karst Plateau , a limestone region of underground rivers , gorges , and caves , between Ljubljana and the Mediterranean sea .
 Karst, Slovenia, Karst Plateau, Ljubljana
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Karst, Slovenia, Karst Plateau, Ljubljana