61089
In Costa Rica and Panama , the first population movements may begin in July and early August and depending on the year , may be very massive , continuing unabated for as long as five months .
 Costa Rica, Panama
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:
 Costa Rica, Panama