Original: It is elliptical in plan and is 189 meters ( 615 ft / 640 Roman feet ) long , and 156 meters ( 510 ft / 528 Roman feet ) wide , with a base area of .
Simplified: It is oval shaped , 189 meters ( 615 ft / 640 Roman feet ) long , and 156 meters ( 510 ft / 528 Roman feet ) wide .