same orientation. This highly planned city-layout suggests that the avenue may have been planned since its earliest phases of urbanization. The main sector of the avenue was evidently the section between the Moon Pyramid and the Rio San Juan channel. This part of the avenue was lined with long talud-tablero platforms. Access to flanking residential zones was confined to masonry stairways with balustrades. The width of the avenue varies significantly between different sections, ranging from 40 to 95 meters. A large long channel under the floor of the avenue gathered rainwater from neighboring architectural units and drained it into Rio San Juan.
             As originally built, the Sun Pyramid was approximately 215 by 215 m at the base, and about 63 m high. It was significantly enlarged at least twice in later periods, resulting in a final size of 225 m along each side. The northern half of the city, the pyramid was located on the east side of the Avenue of the Dead. If the area of monumental construction between the Moon Pyramid and the San Juan Canal is regarded as the central zone of the city, the Sun Pyramid is located at i
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