Possible Clues:

• Ancient region by the Adriatic
• Dicky's fine lines about Orsino's place
• Ancient Adriatic land
• Ancient region wrongly given insubstantial backing
• Ancient Adriatic region, scene of 'Twelfth Night'
• Adriatic coastal area, scene of Twelfth Night
• Area once making you sick — the reverse of well-ventilated
• Roman Adriatic province
• Don’t start stupid song about Shakespeare’s country
• Classical Albania