Name: Tvirtta
Feature type: name, no symbol
Segment grid: 3B1
No doubt the copyist had Tvrrita in mind, but he actually wrote Tvirtta, with the "i" truncated; the name straddles the river course.
Onward stretch:
- XVI (16) Piscinas
- The start of this stretch is not marked.
- River crossing: Fl. Aventia (river, no. 21)
Previous stretch:
- (no distance figure) Pisis