The castle was originally built on the site of an earlier Latgalian wooden hillfort.
Following the 1966 flooding, the water level rose by approximately 15 meters, significantly altering the original landscape of the castle's base.
The castle features a rare example of a medieval 'Dansker' or toilet tower that has survived partial demolition.
Architectural remnants include elements of both Romanesque and early Gothic styles.
During the 17th century, the castle functioned as a residence for the Swedish administration in Livonia.
Koknese Castle Ruins stand on a promontory at the confluence of the Daugava and Perse rivers. Originally built in 1209 by the Bishop of Riga, the stone fortress served as a strategic military stronghold for the Archbishopric of Riga. The castle underwent several expansions under the Livonian Order, the Polish-Lithuanian Commonwealth, and the Russian Empire. Much of the original structure was destroyed during the Great Northern War in 1701. In 1966, the construction of the Pļaviņas Hydroelectric Power Station caused water levels to rise, permanently flooding the lower levels and the base of the castle. Today, the ruins remain managed as an open-air historical site accessible for exploration. The site features preserved segments of medieval fortifications and stone vaulted chambers. Visitors walk through the remains of the curtain walls and towers overlooking the modern reservoir. The site serves as a testament to the layered medieval history of the Baltic region.
From the edge of the park path where the castle ruins are framed against the backdrop of the Daugava River.
Wear sturdy, closed-toe walking shoes as the terrain around the ruins is uneven and includes stone stairs.
The site is largely outdoors with minimal cover; bring protection against sun or sudden rain.
Visit the nearby Koknese Park for a broader view of the castle from the surrounding landscape.
Attempting to swim in the reservoir directly adjacent to the ruins, as underwater currents and debris are present.
The park area is generally open year-round, but access to specific interior ruins may be limited during winter months due to ice or snow accumulation.
Respect the ruins by not climbing on fragile walls or removing stones.
