Possible Clues:

• Den ___, Nederland
• Den __, Nederland
• Den __, Netherlands
• Den ___ (the Hague)
• Den ___ (Dutch seat of government)
• Den ___ (home of the International Criminal Court)
• Den ___ (Serbian war crimes trial locale)
• Den ___ (Dutch city, to the Dutch)
• City name part that's Dutch for 'hedge'
• Den ___, Dutch city