Words to Describe uncrossable

Things uncrossable often describes ("uncrossable ________")

• moat
• borders
• border
• crevasse
• divide
• frontier
• chasms
• river
• deserts
• boundary
• ocean
• rubicon
• gap
• abyss
• desert
• barriers
• line
• rivers
• bridge
• wall
• gulf
• bar
• canyon
• chasm
• sea
• threshold
• distance
• miles
• boundaries
• barrier
• lines
• bridges
• mountains