51796
Until recently the Molonglo River had a history of sometimes calamitous floods ; the area was a flood plain prior to the filling of Lake Burley Griffin .
 Molonglo River, Lake Burley Griffin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Molonglo River, Lake Burley Griffin