Old Bridge is the border location between the Center Region and the Cotton Plains.
To access the Cotton Plains, you must first repair the bridge. Construction requires the following resources:
— 40 Maple Boards
— 40 Iron Fasteners
— 40 Linen Rope
— 10 Tar
Later in the game, access to Rio Bravo requires reaching Level 115 and completing the Teklanika storyline.
After progressing through several related side quests, you will receive the “Rebuild the Bridge” quest. Completing this task upgrades the bridge into a railway bridge, which unlocks access to Rio Bravo.
To complete the railway bridge upgrade, you will need:
— 60 Alder Boards
— 20 Reinforced Marble Blocks
— 10 Electrical Toolsets
— 10 Tungsten Tools
— 10 Tungsten Fasteners
— 3 Bridge Frame Components
Once the bridge is rebuilt, you will gain access to Rio Bravo.