Seosaengpo Castle

Seosaengpo Castle is a Japanese fortress on a mountain slope in Seosaeng-myeon with a rectangular layout and multiple elevated citadels. The structure follows typical Japanese castle design and takes advantage of the natural terrain to create defensive positions.

The fortress was built from 1592 to 1593 by Japanese General Katō Kiyomasa during the invasion of Korea. It was constructed as part of a series of military installations created during this conflict.

The fortress represents Japanese military design from the late 1500s and remains a protected cultural site for Ulsan. It stands as a physical record of a historical period that still shapes how locals understand their region.

Public buses connect to the site from central Ulsan, though the route requires multiple transfers toward Seosaeng-myeon. Wear sturdy shoes since the terrain is steep and hiking paths are unpaved.

Sections of the original fortress walls now form the foundations of houses built nearby over the centuries. This blending shows how historical structures became woven into the modern settlement.

Location: Seosaeng-myeon

Inception: 1593

Founders: Katō Kiyomasa

GPS coordinates: 35.38345,129.33406

Latest update: December 10, 2025 16:30