127740
The navigable River Havel flows through the lake , entering it at its northern end adjacent to central Potsdam , and leaving it at its southern end via a short channel to the Schwielowsee between Caputh and Geltow .
 Potsdam, Caputh, Geltow
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Potsdam, Caputh, Geltow