1) Explorers penetrated deep into unknown regions.

2) Somewhere, in an unknown region, his spirit, his lost ghost, flew above dark forests.

3) Unknown Region work room.

4) Even hardy explorers needed strongpoints to which they could return after exhausting expeditions into unknown regions.

5) But there was a more real life for Hester Prynne here, in New England,[http://sentencedict.com/unknown region.html] than in that unknown region where Pearl had found a home.

6) The algorithms then estimate F, B, and for all pixels the unknown region.

7) But there was a more real life for Hester Prynne, here, in New England, that in that unknown region where Pearl had found a home.

8) Various PCR-based methods are available for chromosome walking from a known sequence to an unknown region.

9) The castaways proceeded toward the north of the land on which chance had thrown them, an unknown region, the geographical situation of which they could not even guess.

10) Amid rumors that there were prehistoric mammoths wandering around the unknown region and that somewhere in its wilds was a mountain of rock salt 80 by 45 miles in extent, the two captains set out.

11) An exploratory action, expedition, or device, especially one designed to investigate and obtain information on a remote or unknown region.