Izapa was a large site that included extensive monuments and architecture. From north to south, the whole site is about 1.5 km long. The New World Archaeological Foundation project at Izapa mapped 161 total mounds. Izapa's Formative period core (850–100 BCE) has six major plazas. Groups A, B, C, D, G, and H are located around the central area of the site, on the western shore of River Izapa. "The core area of Izapa is formed by Groups A to E, G and H, which correspond to the period of the greatest apogee of the site, circa 300 B.C. to 50 B.C. " Group F, is located at northern end of the site. This group contains a ballcourt among other structures, and corresponds to the late occupational phase of the site. Group F includes later occupation and construction associated with the Terminal Formative (100 BCE – 250 CE), Early Classic (250–500 CE), Middle Classic (500–700 CE), Late Classic (700–900 CE), and Early Postclassic (900–1200 CE) periods. Groups A, B, and F are open for tourism today through Mexico's National Institute for Anthropology and History (Instituto Nacional de Antropología e Historia).