10466
It used to be the biggest popular sport event in East Germany , and is still one of the biggest ultramarathons in Europe , attracting more than 10,000 participants , including those for other distances .
 East Germany, Europe
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:
 East Germany, Europe