Pantokratoras Castle, Ottoman coastal fortress in Pantokratoras, Greece.

Pantokratoras Castle is a pentagon-shaped fortress positioned at the entrance to the Amvrakikos Gulf with tall surrounding walls that define its outer boundary. The interior features a central courtyard enclosed by vaulted chambers that form the core of the complex.

The fortress was designed in 1807 by French engineer Vaudoncourt for Ali Pasha as part of regional strategic plans. Years later the structure transitioned to serve as a state prison, marking a major shift in its purpose.

The castle's name comes from the Pantokrator, the Orthodox title for Christ as almighty ruler, a dedication that points to the religious layer added to Ali Pasha's fortifications. Look for the small chapel inside the walls, where the garrison's devotions took place alongside the gun platforms.

The fortress sits approximately 400 meters from the underwater tunnel connecting Preveza and Aktio, making it easily reachable from either side. Both the northern and eastern entrances are open to visitors, allowing flexible routes through the complex.

The castle is one of the very few surviving coastal forts of the rivellino type, a low outwork built in front of a main fortification. Ali Pasha chose the western tip of the Preveza strait for it because improved cannon ranges in the late 18th century let the passage be controlled from farther off.