A narrowing of the spur canyon just north of the main overlook of Horseshoe Bend, Arizona, United States of America, North America

A narrowing of the spur canyon just north of the main overlook of Horseshoe Bend, Arizona, United States of America, North America

A narrowing of the spur canyon just north of the main overlook of Horseshoe Bend, Arizona, United States of America, North America

Road signs, England, United Kingdom, Europe

Thanks to a flashlight, the doctor can assess the state of the eyelids and the eye (conjonctiva, iris, pupil, transparency of the cornea) test the pupillary relfex (narrowing of the pupil reacting to light).

Cave explorer forces his way up through a narrowing in the rock in a cave high in the White Mountains on the island of Crete.