The term RECESSED AREA IN A CHURCH can be summarized as an APSE, which is a four-letter word. An APSE is a semicircular recess in the wall of a church, typically at the end of the chancel, containing the altar and often also the bishop's throne. It is usually found in traditional Christian churches, such as Roman Catholic, Anglican, and Eastern Orthodox. The APSE is often used to house the choir and organ, and is sometimes used for other purposes, such as housing a baptistery or a treasury.