The Grand Gulf Mound (22CB522) is an Early Marksville culture archaeological site located near Port Gibson in Claiborne County, Mississippi, on a bluff 1 mile (1.6 km) east of the Mississippi River, 2 miles (3.2 km) north of the mouth of the Big Black River. The site has an extant burial mound, and may have possibly had two others in the past. The site is believed to have been occupied from 50 to 200 CE. Copper objects, Marksville culture ceramics and a stone platform pipe were found in excavations at the site. The site is believed to be the only site in the to have been actively involved in the Hopewell Interaction Sphere. It is one of four mounds in the area believed to date to the Early Marksville period, the other three being the Marskville Mound 4 and Crooks Mounds A and B, all locat