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View from the southeast looking northwest across the Macellum. In the northwest corner, under the protective roof, some frescoes are preserved. To the left of the covered area, the two entrances from the Forum are visible. The round structure in the center of the image is a tholos (see below).
A Macellum is a large market area where produce (fruits and vegetables) and fish were sold. They are typically surrounded by shops and often will have a round (tholos) structure in the center. The function of the tholos can vary from macellum to macellum, but often times they contained water holdings tanks where fresh fish could be kept for sale—fishscales and fishbones were found under this tholos. This Macellum measures 120 x 90 feet and was surrounded by shops.