11.   Since Albuquerque is surrounded by mountains, only a wind from the south can direct enough moisture up the sloping terrain to bring a downpour.

12.   Small mountains of trash surround them now.

13.   We are surrounded by mountains.

14.   A mountain surrounds three sides of the courthouse, which faces the Arabian sea but is about six miles from the Aden harbor.

15.   Air pollution builds up quickly in hot, windless weather because the city is built on a coastal plane that is surrounded by mountains on three sides.

16.   In a country known for deserts and mountain peaks, this city, resting on a plain surrounded by mountains, is known for fertility and flowers.

17.   Its single runway is surrounded by mountains that force approaching aircraft to make steep descents.

18.   Lanzhou is in a river valley surrounded by mountains that prevent pollution from dispersing.

19.   The Blida-Medea road is surrounded by mountains that provide cover for armed groups, which use such roadblocks to rob travelers.