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A third lake , Lake Kivu , rests on the border between the Democratic Republic of the Congo and Rwanda , and contains massive amounts of dissolved CO. Sediment samples from the lake taken showed an event caused living creatures in the lake to go extinct around every 1000 years , and caused nearby vegetation to be swept back into the lake .
 Lake Kivu, Democratic Republic of the Congo, Rwanda
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:
 Lake Kivu, Democratic Republic of the Congo, Rwanda