Great Colonnade at Apamea as part of the intersection. The colonnade was further intersected by side streets at regular intervals of . The colonnade passed through the center of the city and several important buildings were clustered around it, including the baths, the agora, the Temple of Tyche, the nymphaeum, the rotunda, the atrium church and the basilica. The street within the colonnade was wide and paved with large polygonal limestone blocks. On either side of the street a wide colonnade ran its full length. The columns were high and in diameter. They stood on square bases of on a side and high. The
Xystus (architectural term) Xystus (architectural term) Xystus was the Greek architectural term for the covered portico of the gymnasium, in which the exercises took place during the winter or in rainy weather, etc. The Romans applied the term to the garden walk in front of the porticoes, which was divided into flower beds with borders of box, and to a promenade between rows of large trees. "Xystus" derives from the Greek word "xustos", meaning "smooth", due to the polished floor of the xystus. "Xystus" was used, by extension, to refer to the whole building containing the gymnasium and portico, as in the xysti