Possible Clues:

• Extremely cold — at the extremes
• Like the far north or south
• Remote northern city between two rivers
• Opposite, bear or expedition?
• Word before "bear" or "Express"
• ___ bear (Arctic predator)
• Big name in seltzer
• "The ___ Express" (children's book)
• Like some regions that experience midnight sun
• Word before "opposite" or "bear"