6830
As a glacial lake , Swartswood Lake eventually will atrophy into a bog , a natural progression that is estimated to occur in 100,000 years .
 location: Swartswood Lake
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Swartswood Lake