Anna Site, Archaeological site in Adams County, Mississippi, United States

The Anna Site is a Plaquemine culture mound complex on a bluff above the Mississippi River, 10 miles north of Natchez. Eight platform mounds survive; six ring a central plaza, and Mound 3, the largest at 50 feet (15 m), sits on the bluff edge with a ramp descending to the plaza toward Mound 5, 300 feet (91 m) away and 12 feet (3.7 m) high. Mounds 7 and 8 lie east and northeast of the main group.

Occupation began during the Gordon phase (1000–1200) of the Coles Creek period, and mound building had certainly started by the Anna phase (1200–1350), continuing through the Foster (1350–1500) and Emerald (1500–1680) phases. Over some 300 years the site grew into a multi-mound center, possibly ruled by a hereditary elite, and was abandoned around 1500 with no later reoccupation. Warren K. Moorehead and Calvin S. Brown excavated in 1924; John L. Cotter's 1951 work helped establish the Natchez Bluffs chronology, and the site became a National Historic Landmark on September 14, 1993.

The site is the type site for the Anna phase (1200–1350 CE) of the Natchez Bluffs Plaquemine chronology, a reference point archaeologists use to date other sites in the region. Its name comes from the Anna phase, and the six mounds around the plaza show how the community laid out its ceremonial core. Plaquemine pottery sherds lie scattered in the ravines around the mounds.

The site lies on a bluff above the Mississippi River, 10 miles (16 km) north of Natchez, reached by road; deep ravines surround the mound group, so approach from the plaza side. Ground is uneven and unshaded, with pottery fragments scattered across the surface. No visitor facilities or marked trails are documented, so check locally before setting out.

Mound 3, the tallest at 50 feet (15 m), sits directly on the bluff edge above the Mississippi and has a ramp running down its front onto the plaza toward Mound 5, about 300 feet (91 m) away. Mound 4, just northeast of Mound 3, was excavated and yielded evidence of a structure on its summit.