The term 'Altar Location' can be summarized by the crossword solution of APSE, which stands for an architectural feature found in churches. An APSE is a semicircular recess in the wall of a church, typically at the east end, containing the altar. It is often covered with a vault or semi-dome and is usually flanked by two smaller chapels. The APSE was a common feature of early Christian churches, and is still found in many churches today.