The South Ostia Highway (南オスティア街道) is a road connecting Heimdallr with the Himmel Cemetery and the Sutherland Province through the North Sutherland Highway.
Trails of Cold Steel III[]
Background[]
Thors Branch Campus sets up camp near the south highway while the main campus sets up on the north end of the city for both their Field Exercises taking place in Heimdallr. On the day of the Summer Festival, the Imperial Fishing Club and the Fisherman's Guild have a competition along the river, with Rean Schwarzer participating on the side of the Fisherman's guild, facing off against Lakelord II.
After Ash Carbide shoots Emperor Eugent during the Summer Festival party, the entire branch campus is confined to their camp and the Derfflinger, except for Altina Orion, who is summoned by the Intelligence Division. Class VII is able to escape with help from Celine and Emma, teleporting to the nearby Himmel Cemetery.
Once the Gral of Erebos appears, Aurelia Le Guin orders the branch campus to take the Derfflinger to the Gral's site to help Class VII break through while she takes her personal mech to meet with Wallace Bardias and the Weissland Army.
Map[]
| South Ostia Highway |
|---|
|
Enemies[]
- Tail Jumper
- Sinister Hornet
- Hz Maus: W/ Others
- Goldcider
- Lustful Arachne: Quest
- Principal Le Guin: Quest
- Tail Jumper: Quest
- Sinister Hornet: Quest
- Goldcider: Quest
Treasure Chests[]
| Key | Contents |
|---|---|
| 1 |  Tear All Balm
|
| 2 |        All Sepith ×100
|
| 3 |  Lost Genesis R
|
| 4 |  Faint III
|
Quests[]
- Does It Belong In A Museum?: To test the Eternal Kandelaar, Class VII takes it to the highway.
- Legendary Recipe: A Moon Truffle can be found in the secluded central area.
- South Ostia Highway Monster: Lustful Arachne can be found in the secluded central area.
- Even Greater Heights: Aurelia offers Rean to spar while he uses Spirit Unification.
Fishing[]
| Location | Fish | ||
|---|---|---|---|
 South Ostia Highway - North Side |
Cangiru | Carp | Red Perch |
| Noble Carp | Gold Salmon | Deep Grouper | |
 South Ostia Highway - South Side |
Red Perch | Rainbow Trout | Gold Salmon |
| Deep Grouper | Emperor Perch [note 1] | — | |
- ↑ Only after catching 24 types of fish, obtaining all rod upgrades and taking part in the fishing competition on 7/17.
