Captain Lourie can be found at Steamboat Pier.
He asks you to help with repairing the steamboat La Belle by completing his quests and gathering the necessary ship parts. To fix La Belle, you'll need:
— 100 Ash boards
— 40 Steel ingots
— 100 Coal
— 50 Steamboat parts (can be obtained from Adam McCoy)
Once La Belle is repaired, Captain Lourie will transport you to the Marshlands, granting access to new locations, enemies, and higher-tier resources.