Chancel

Plan of a large Latin cross church, with the chancel (strict definition) highlighted. This chancel terminates in a semicircular sanctuary in the apse, and is separated from the curved walls to the east in the diagram by an ambulatory.

In church architecture, the chancel (also known as the sanctuary or presbyterium) is the space around the altar, including the choir, at the liturgical east end of a traditional Christian church building. It may terminate in an apse.