Possible Clues:

• Everglades
• Fen worker claiming pound to add to spoils
• Swampy tract spoils hot country
• It's hard to come down on planet -- unsuitable territory to alight on!
• Ruins alight after encroachment by hot, damp patch
• Everglades, e.g.
• Waterlogged area
• Boggy area
• Boggy terrain making it hard to touch down on planet