Reader-added tags include "Umanose" (lit., "Horse's Back," a knife-edge ridge on a hiking trail near Kobe), "Save point before the final boss," and "Mountain (ant) lion" (based on the sandy trap of an ant lion larva (ari jigoku, lit., "ant hell") vs. this being yama jigoku, "mountain hell").

Moonspeaker said in comment #2612669:

"Umanose" (lit., "Horse's Back," a knife-edge ridge on a hiking trail near Kobe)

Apparently, this ridge they're climbing is also called "Umanose".