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They are similar in character to the nuraghe of Sardinia , though of smaller size , and consist of round or elliptical towers with sepulchral chambers in them , built of rough blocks of lava .
 Sardinia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Sardinia