In such a narrow zone, just outside the black hole's event horizon, distinctions of matter and energy would blur.

Because the river has less room under the bridge, the water must move quicker while in the narrow zone.

They form, in fact, in a narrow zone near the crest of the highest mountains.

However, the clearing was limited to a relatively narrow zone ahead of the dry line.

At last they were back in the narrow zone where an unprotected man could safely dive.

They can cross the border but cannot leave a narrow commercial zone that extends no more than 20 miles.

Far from being randomly distributed, nearly all seismic activity is concentrated in relatively narrow zones.

A significant portion of the plants recorded to date are specialists - associated with a narrow ecological zone.

Lower surface is black with a narrow brown zone at the margins.

They have, along the midrib, a narrow zone containing chlorophyll.