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Ambulatory highlighted
Source: Wikimedia Commons

Ambulatory is a general term for a covered walkway such as a cloisterCovered walkway usually set out in the form of a square., and more specifically for the walkway linking the two chancelPart of a church containing the altar, used by the officiating clergy. aisles behind the high altar in a Christian church.[1]

The feature originated in France as a processional passage around a shrine accommodated within a crypt, as seen at Chartres Cathedral, and was subsequently widely adopted in the design of Romanesque churches.[2]

The term ambulatory derives from the Latin ambulatorium, meaning a place to walk, especially a covered one.[3]