The Fortress of Duha (ドゥーハの砦 Doūha no Toride) is a location mentioned in the first Suikoden. It is located in the region of Senan.
As part of the Toran Liberation Army strategy to take Senan and rescue Viktor and Warren from Moravia, Lepant was ordered to attack the Fortress of Duha with the intention of drawing out reinforcements from Moravia to give time for the castle to be infiltrated by the Liberation Army officers. Lepant's forces would fall back and as the Imperial reinforcements fell back to Moravia, they would be ambushed by the Jowston army.
- The Fortress of Duha is never seen and does not have any sprite or indicator on the world map.