They can be divided into two separate clusters: one to the west of the River Medway and the other on Blue Bell Hill to the east, with the distance between the two clusters measuring at between 8 and 10 km. The western group includes Coldrum Long Barrow, Addington Long Barrow, and the Chestnuts Long Barrow. The eastern group consists of Kit's Coty House, Lower Kit's Coty House, the Coffin Stone, and several other stones which might have once been parts of chambered tombs. It is not known if they were all built at the same time, or whether they were constructed in succession, while similarly it is not known if they each served the same function or whether there was a hierarchy in their usage.