Related Clues:

• Bark
• Deep divide
• Serenade the moon
• Howl, as at the moon
• Chasm
• Unbridgeable disparity
• Raise a howl
• Deep ravine
• Wide rift
• Montego or Hudson
• Great divide
• Window type
• San Francisco/Oakland separator
• Bark at the moon, perhaps
• Howl at the moon