There were no threats, no unstable terrain, no threat of weather or native life.

The highway route runs through exceedingly rugged and unstable terrain.

This rugged track pattern also is well suited to lend much needed tractive support in muddy or unstable terrain.

By day, amid a persistent drizzle, some residents scrambled over the unstable terrain to try to rescue furniture and other possessions from the muck.

They use their long arms and legs to negotiate wet and unstable terrain and also to dig up roots.

Deadeye is mobile, but his size makes it hard for him to negotiate unstable terrain.

Construction began on 10 March 1879, but quickly fell behind schedule due to unstable terrain and slips.

Jericho is in a rift valley, an unstable terrain prone to earthquakes.

Erratic winds and steep, unstable terrain made the fire, which was discovered on Friday, hard to fight.

Washington can become unstable terrain for journalists if they get too close to their sources.