Vertical service bays in a building's structure, designed to house communications, electrical, and mechanical service distribution equipment in a readily accessible way; a type of accessible service area
A canyon is a long, narrow valley with very steep sides. the Grand Canyon. Very narrow, deep valley cut by a river through resistant rock and having steep, almost vertical sides. Canyons occur most often in arid or semiarid regions. Some canyons (e.g., the Grand Canyon) are spectacular natural features. See also submarine canyon. Black Canyon of the Gunnison National Monument Bryce Canyon National Park Canyon de Chelly National Monument Grand Canyon Grand Canyon series Hells Canyon Kings Canyon National Park submarine canyon Walnut Canyon National Monument
A canyon is a deep valley with very steep sides - often carved from the Earth by a river
A stream-cut chasm or gorge, the sides of which are composed of cliffs or a series of cliffs rising from its bed Canyons are characteristic of arid or semiarid regions where downcutting by streams greatly exceeds weathering (Bates & Jackson 1984)