97608
The biggest are the cities of Prague ( 496.21 " km ) , Brno ( 230.18 " km ) and Ostrava ( 214.23 " km ) , and the town of Ralsko ( 170.23 " km , including a former military area , with only 2,000 inhabitants ) .
 Prague, Brno, Ostrava, Ralsko
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:
 Prague, Brno, Ostrava, Ralsko