Possible Clues:

• Hobbit's milieu
• Home of Fangorn Forest and the Misty Mountains
• Place with elves
• "The Lord of the Rings" region, and a hint to the shared feature of 17-, 28- and 44-Across and 26-Down
• 'The Lord of the Rings' setting ... or a feature of 17-, 24-, 38- and 49-Across?
• Heart that's subsequently broken in fantasy land?
• Home to Frodo and Legolas
• Hobbit world
• King Theoden's home
• Tolkien's imaginary world (that hints at this puzzle's theme)