Castle Otočec is one of the most recognizable Slovenian castles, primarily because of its exceptional location and historical uniqueness. It stands on a picturesque natural islet in the middle of the Krka River, approximately 1 km east of the settlement of Otočec and 6.5 km from Novo Mesto. The river island, nearly 400 meters long and up to 70 meters wide, offered ideal natural protection, making it a perfect site for building a fortress. In the Middle Ages, water served as an important defensive element, which made the location strategically highly advantageous.
The first written records of the castle date back to 1252, placing it among the older medieval fortifications in the Dolenjska region. Initially, it was owned by the Counts of Višnja Gora, who played an important role in the development and defense of the area. Later, ownership changed frequently—various noble families and ecclesiastical landowners held the estate over the centuries. Each owner adapted the castle to their needs, and over time the original fortress gradually transformed into a more comfortable Renaissance and Baroque residence.
In the 16th and 17th centuries, the castle underwent several reconstructions that gave it its present appearance: defensive towers, an inner courtyard, and a characteristic layout of rooms. During this period, Otočec became an important administrative and economic center of the surrounding estates.
The Second World War left a significant mark on the castle. Due to its location and size, it was repeatedly used for military purposes. The war did not spare it: it was partially damaged, and much of its interior furnishings were destroyed or looted. Toward the end of the war, the castle burned down, marking the end of its function as a noble residence.
After 1945, the castle became state-owned. For many years it remained abandoned and in poor condition, as restoration was not among the priorities of the post-war government. Only in the second half of the 20th century did more serious efforts to preserve it begin. Gradually, it was restored with an emphasis on preserving historical elements while adapting it to modern use.
Today, Castle Otočec is declared a cultural monument of national importance. It houses a prestigious hotel that is part of an international chain of high-end accommodations. Surrounded by a park, bridges, and well-maintained walking paths, it has become a popular destination for tourists, weddings, cultural events, and culinary experiences.
Although Slovenia has several castles that once had moats or stood near marshlands, Otočec is the only true water castle in the country that stands on a natural river island. This means that it is not only partially or artificially surrounded by water—the entire architectural concept depends on the Krka River. This feature makes it a rarity even in the broader European context. Moreover, it is one of the few water castles that has preserved its original location, layout, and basic architectural structure, while successfully transitioning into a modern tourist and cultural venue.