| The impressive highway, now five years old, that crosses the previously uncrossable Taklamakan was ostensibly built to allow the development of oilfields. |
| For what bridge shall cross the uncrossable, what ferryman ply for silver pounds on the Great Gulf? |
| There are very few bridges on the footpaths in Skye and even short periods of heavy rain can cause rivers to rise rapidly, often making them uncrossable. |
| Not uncrossable, but a distinct military difficulty. |
| Prior to that, the world had been warmer, the ice caps smaller, sea levels higher and the Channel had consequently been full of water and therefore uncrossable. |
| The survivors were rescued after two of them trekked for days through deep snow until they spotted a Chilean peasant on the far side of an uncrossable mountain torrent. |
