# Ključ Castle

- **Country:** Bosnia and Herzegovina
- **Coordinates:** 43.093401, 18.488900
- **Location Text:** Ključ

Ključ Castle, also known as Ključ Fortress, is a medieval town-fortress situated in Bosnia and Herzegovina. It stands prominently on an elongated slope of high rocks that dominate the valley of the Sana River, overlooking the modern-day town of Ključ in the Una-Sana Canton. The structure was originally built using limestone arranged in dry stone walling techniques. While the exact construction date remains unknown, historical records indicate the fortress was established by the 12th century, potentially replacing a smaller ancient fortification from the Roman era that previously occupied the strategic site.

The fortress holds significant historical importance due to its role as a border defense mechanism, earning it the nickname "key of Bosnia" or ključ Bosne in Serbo-Croatian. This name reflects its critical geographical position within the Bosnian state territory. The site was the location of the notable Battle of Kljuc in 1463 and remained in military use until the 19th century. Today, the castle exists as a ruin under the ownership of the Government of Bosnia and Herzegovina. Despite its dilapidated condition, it retains high cultural value and was officially designated as a Category I National Monument by the Commission to Preserve National Monuments of Bosnia and Herzegovina on May 20, 2003.

As a protected architectural ensemble, Ključ Castle serves as a testament to the region's turbulent medieval history and defensive architecture. Although it is no longer inhabited or used for military purposes, its status as a listed national monument ensures its preservation for future generations. The site offers visitors a glimpse into the past, showcasing the remnants of stone walls that once guarded a vital corridor in the Balkans. Its enduring presence above the river valley continues to define the landscape and historical identity of the town below.

![Photo of Ključ Castle](https://upload.wikimedia.org/wikipedia/commons/2/21/Kljuc%2C_hrad_z_14._stol.jpg)

**Source:** https://en.wikipedia.org/wiki/Ključ_Castle_(Ključ) (Wikipedia, CC BY-SA)