Possible Clues:

• Sacred river of 'Kubla Khan'
• Coleridge's sacred river
• 'Kubla Khan' river
• Xanadu's river
• River of Xanadu
• Sacred river in Coleridge's 'Kubla Khan'
• Sacred river in Xanadu (Coleridge)
• Coleridge's 'sacred river'
• Coleridge's ''sacred river''
• Poetic river visible in aerial photograph