The Submerged Timber Pilings of the Swedish Sea

The waters north of Stegeborgs slottsruin hold a deep history hidden beneath the surface. For centuries, these waters were obstructed by submerged timber pilings known as stæk. These were intentionally placed to block the channel and restrict shipping. We can trace these underwater barriers back to the 7th and 9th centuries, with additional systems appearing in the 11th century. These massive stakes were so effective that vessels were required to navigate around the south side of the island to reach Söderköping, a practice that continued into the 19th century.

On the island, a castle stood as a guardian over this important transit point. The earliest structure is a square brick tower from the early 13th century, and the site underwent constant expansion. During the 16th and 17th centuries, the complex grew to include a round tower and a castle church. It served as a residence for several Vasa kings and functioned as the administrative center for the local archipelago until 1689. The crown eventually sold the site for building materials in the 1730s, leaving behind the sturdy masonry that we see today.

Sources: Wikipedia, OpenStreetMap, Wikidata, Wikimedia Commons