sentences:  The BA-20 Group is situated a few kilometers to the northeast of the site core and includes four platforms dating to the Late Preclassic.The group was already abandoned by the time Río Azul reached its maximum extent; no Early Classic remains have been found in the vicinity of BA-20.The group was reinhabited during the Late Classic, with the general repopulation of Río Azul and the group is estimated to have housed some 2500 people between the AD 692 and 830.