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The lake sees considerable sightseeing and leisure traffic , and also forms a link in a commercial navigation route from the limestone workings at Rüdersdorf , which reaches the Flakensee by a lock at Woltersdorf , and connects to the River Dahme and the Oder-Spree Canal via the Seddinsee .
 Rüdersdorf, Woltersdorf, Oder-Spree
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Rüdersdorf, Woltersdorf, Oder-Spree