What does Joshua 18:11-28 mean?

The lot of the tribe of the people of Benjamin according to its clans came up, and the territory allotted to it fell between the people of Judah and the people of Joseph. On the north side their boundary began at the Jordan. Then the boundary goes up to the shoulder north of Jericho, then up through the hill country westward, and it ends at the wilderness of Beth-aven. From there the boundary passes along southward in the direction of Luz, to the shoulder of Luz (that is, Bethel), then the boundary goes down to Ataroth-addar, on the mountain that lies south of Lower Beth-horon. Then the boundary goes in another direction, turning on the western side southward from the mountain that lies to the south, opposite Beth-horon, and it ends at Kiriath-baal (that is, Kiriath-jearim), a city belonging to the people of Judah. This forms the western side. And the southern side begins at the outskirts of Kiriath-jearim. And the boundary goes from there to Ephron, to the spring of the waters of Nephtoah. Then the boundary goes down to the border of the mountain that overlooks the Valley of the Son of Hinnom, which is at the north end of the Valley of Rephaim. And it then goes down the Valley of Hinnom, south of the shoulder of the Jebusites, and downward to En-rogel. Then it bends in a northerly direction going on to En-shemesh, and from there goes to Geliloth, which is opposite the ascent of Adummim. Then it goes down to the stone of Bohan the son of Reuben, and passing on to the north of the shoulder of Beth-arabah it goes down to the Arabah. Then the boundary passes on to the north of the shoulder of Beth-hoglah. And the boundary ends at the northern bay of the Salt Sea, at the south end of the Jordan: this is the southern border. The Jordan forms its boundary on the eastern side. This is the inheritance of the people of Benjamin, according to their clans, boundary by boundary all around. Now the cities of the tribe of the people of Benjamin according to their clans were Jericho, Beth-hoglah, Emek-keziz, Beth-arabah, Zemaraim, Bethel, Avvim, Parah, Ophrah, Chephar-ammoni, Ophni, Geba—twelve cities with their villages: Gibeon, Ramah, Beeroth, Mizpeh, Chephirah, Mozah, Rekem, Irpeel, Taralah, Zela, Haeleph, Jebus (that is, Jerusalem), Gibeah and Kiriath-jearim—fourteen cities with their villages. This is the inheritance of the people of Benjamin according to its clans.