Ravine
A ravine was a geographical formation similar to a canyon, but narrower; and was similar to a valley, but with steeper slopes.

In 2153, Phlox and T'Pol got infected with a microbe on a planet they explored. Phlox speculated they were infected in the second ravine the two had entered. ()

In 2269, a group, including James T. Kirk and Spock, blocked a ravine on the mad planet to block the flow of lava. ()

In 2371, when Kira Nerys and Shakaar Edon hid in the Dahkur Hills, Kira projected false lifesigns about 700 meters past a ravine to confuse the pursuing Bajoran Militia. ()

In 2373, Zahir was found unconscious at the bottom of a ravine near a Mikhal Traveler outpost. ()

In 2375, a Starfleet force, led by Benjamin Sisko, placed subspace mines in a ravine on AR-558 to detonate them when attacking Jem'Hadar passed through it. ()

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Landforms