Albert Barnes Commentary Joshua 15:7

"and the border went up to Debir from the valley of Achor, and so northward, looking toward Gilgal, that is over against the ascent of Adummim, which is on the south side of the river; and the border passed along to the waters of En-shemesh, and the goings out thereof were at En-rogel;" — Joshua 15:7 (ASV)

The going up to Adummim - Rather, “the ascent or pass of Adummim” (Compare to Joshua 15:3, margin), on the road from Jerusalem to Jericho. Its name signifies “red” and is explained by Jerome as attributed to the frequent bloodshed there by robbers. This road is the scene of the parable of the Good Samaritan. Possibly the name may be due to some aboriginal tribe of “red men,” who held their ground in these strongholds after the invaders had driven them from the rest of the country.

En-shemesh - That is, “fountain of the sun;” undoubtedly the one now called “the Fountain of the Apostles,” about two miles from Jerusalem, and the only well on the road to Jericho.

En-rogel - That is, “fountain of the fullers” near the walls of Jerusalem. It was here that Jonathan and Ahimaaz concealed themselves after the rebellion of Absalom, in order to obtain news for David, and here Adonijah gave a feast to his adherents in preparation for an attempt on the crown (Compare to the marginal references). It is probably the modern “Fountain of the Virgin,” the only real spring near Jerusalem, from which the Pool of Siloam is supplied. Others identify it, less probably, with the “Well of Job,” situated where the valleys of Kedron and Hinnom unite.