8800
On 11 January 1923 , the Occupation of the Ruhr was carried out by the invasion of French and Belgian troops into the Ruhr .
 location: Ruhr
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: Ruhr