Chirand is situated 10 km south-east of Chapra, the district headquarters of Saran district, and the same distance south off the Sonepur–Chapra road. The village with an extensive mound is situated on the northern bank of the Ganga, and the confluence of the Ganga and the Ghagra is just some distance away in the west near Revelganj. The Ganga also meets the Sone a few kilometres away from the site. 2½ km north of the site there is a dried-up bed, possibly a loop of the Gandaki. So, four rivers converge on or near the site. This must have provided it a very fertile soil for the development of pre-historic and historical cultures. It is very likely that in ancient times the confluence was actually at Chirand.
Carlyle in 1879–80 says that it was situated just at the junction of an old river channel (old bed of the Ghogra river) with the Ganges. The mound has been being cut by the Ganga since long, but the face of the mound overlooking the river shows jutting bricks of ancient times and potsherds. There is a mosque on the top of the mound, which was erected by Sultan Abul Muzaffar Hussain Shah of Bengal in A.D. 1503. The mosque contains remains of Hindu pilasters and shows parts of an earlier Hindu temple; its materials were used in the construction of the mosque.
Chirand has given a continuous cultural sequence beginning from the Neolithic to the Pala period. The discovery of the Neolithic culture in 1970 in the Ganga valley was very significant as till then no Neolithic strata was exposed in the course of archaeological excavations in northern India.
Neolithic Culture — The Chirand Neolithic community practised agriculture; evidence for wheat, rice, mung, masur and peas has been found. People lived in circular huts made of mud and reeds. Both stone and bone tools were abundant. Pottery was decorated with appliqué, incised and punctured designs. A distinctive feature was post-firing painting in ochre colour. Radiocarbon dates suggest the beginning of the Neolithic earlier than 2500 B.C., possibly c. 3000 B.C.
A luxuriant Chalcolithic culture with distinctive black-and-red ware was discovered. The cultural period has two phases: ‘A’ without iron but with copper, and ‘B’ with iron in the upper strata but without N.B.P. The total Chalcolithic deposit is 5.50 m thick. The earliest C14 date for Chalcolithic Chirand is 1600 B.C.
Period III starts with the emergence of the Northern Black Polished Ware (N.B.P.). Iron implements include sickles, axes, ploughshares, daggers, lances and knife-blades. A rare find is a terracotta mask (length 35 cm, breadth 32.5 cm) of a human figure on both faces — a female and a male — assigned to the Mauryan period.
Period IV (c. 100 B.C. to 30 A.D.) revealed structural remains of well-burnt bricks of both monastic and secular character. A Buddhist monastery built in blocks, each containing three cells with a verandah, was exposed. Five building stages are represented.