What is Gelilos?
Bi'ur ha'Gra: It is Gilgal mentioned among Yehudah's cities. 1
Hagahah: Gilgal is not mentioned on Yehudah's border! And why does it say "v'Yatza" (which implies that the border jutted out or in)? We must say that the border went near Gelilos, i.e. Devir, which is mentioned on Yehudah's border.