Borsch Castle also known as the Sopot Castle is a historic citadel near the village of Borsh in Albania, near the coast of the Ionian Sea. The castle was built in antiquity, most probably in the 4th century BC, but was rebuilt four times in the periods from the early Byzantine to the late Middle Ages. The ruins of the ancient stronghold stand on the hill Sopot, whose name has a Slavic origin. The best preserved castle walls were rebuilt in a medieval style.
The first mention of Borsch Castle dates back to the 13th century and was found in the records of Archbishop Demetriusz Chomatian. In 1258, the stronghold was given as a dowry to Helena Angelina Doukaina, whose marriage to the King of Sicily was an alliance against the growing power of the Nice Empire. After the capture of Albania by the Ottoman Empire, a public register of land from 1431, lists Sopot with 60 households.
Currently, the remains of the Sopotos castle are an important tourist attraction in the Albanian town of Borsch. Inside, the fortress was divided by a wall in half. Triangular towers were added later, most likely in the middle of the Byzantine period. Inside the Sopot castle are the ruins of various rooms and cisterns.