He tried to concentrate on his training for unknown territory.

She'll even risk a little unknown territory if it means reaching the goal.

For me, it was unknown territory, and finding my way around hadn't been easy.

But neither gave light enough for further travel over unknown territory.

He was like a man who has made one step forward into unknown territory and stands looking for a path.

Once again, he was about to enter unknown territory, his natural habitat.

But now, once again, he was heading into unknown territory.

They seemed to be going straight under the mountain, deeper into unknown territory.

But since we're both in unknown territory, the only thing that's certain is the fact neither one of us knows anything for sure.

To some extent this was unknown territory to him as well.