The lower part of the gutter is ◄3-1/2 feet/1.1 meters► high to the lower ledge/rim that surrounds the altar. The lower ledge is ◄21 in./53 cm.► wide. The upper part of the altar is ◄7 feet/2.1 meters► high, up to the upper ledge. That ledge is also ◄21 in./53 cm.► wide.