• Abysses
• Big drops
• Big gaps
• Challenges for daredevil motorcyclists
• Deep clefts
• Deep cracks
• Deep divides
• Deep gorges
• Deep holes
• Deep rifts
• Deep, deep holes
• Deep, narrow gorges
• Divides
• Gaping holes
• Gaps
• Gorges
• Great divides
• Gulfs
• They're the pits
• Wide-open spaces
• Yawning gaps
• Yawning gorges