Seibal

thumb|right|300px|Structure A-3 at Seibal. thumb|right|200px|Stela 11 at Seibal. Seibal (), known as El Ceibal in Spanish, is a Classic Period archaeological site of the Maya civilization located in the northern Petén Department of Guatemala, about 100 km SW of Tikal. It was the largest city in the Pasión River region.

The site was occupied from the Preclassic Period through to the Terminal Classic, with a significant hiatus. The principal phase of occupation dates to the Late Preclassic (400 BC – AD 200), followed by a decline in the Early Classic (AD 200–600). Seibal experienced a significant recovery in the Terminal Classic immediately prior to its complete abandonment, reaching its second peak from about 830 to 890, with a population estimated at 8–10,000 people. The dates on the stelae at Seibal are unusually late, with monuments still being dedicated after the Classic Maya collapse had engulfed most of the Petén region. Many of Seibal's late monuments show artistic influence from central Mexico and from the Gulf Coast of Mexico.