What is the main literary effect of many place names in verses 17–19?

Labīd ibn Rabīʿah: The Departing Caravan, Memory of Nawār and Distant Destinations (Verses 11–19)

• Emphasizing Nawār’s remoteness and uncertainty of finding her
• To set out a confirmed itinerary
• To enumerate the tribes of each locality
• To report Nawār’s invitation to travel