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The river is approximately long , of which about is in Belgium ( provinces of Liège and Limburg ) and in the Netherlands ( province of Limburg ) , where it flows into the river Meuse at Maastricht ( Netherlands ) .
 Belgium, Liège, Limburg, Netherlands, Limburg, Meuse, Maastricht, Netherlands
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Belgium, Liège, Limburg, Netherlands, Limburg, Meuse, Maastricht, Netherlands