Vers-le-Château, ville médiévale, Castle ruin in Bois-d'Amont, canton of Fribourg, Switzerland

The Château d'Arconciel is a castle ruin set on a narrow rocky ridge on the right bank of the Sarine river, in the area of Bois-d'Amont in the canton of Fribourg. The remains include a large square tower, stretches of stone wall, and a ditch that once controlled access to the site.

The lordship of Arconciel was first recorded in 1082, when the land was granted to a man named Conon by the emperor. By the 15th century the castle was already falling into ruin, and its stones were later taken to build other structures in the surrounding area.

The ruin takes its name from the old lordship of Arconciel, which gave its identity to the castle and the surrounding community for centuries. Visitors walking the site today can still make out the shape of the defensive ditch and the rocky plateau where a small medieval settlement once stood.

The site lies about a kilometre southwest of Arconciel village, on a plateau 50 metres above the Sarine, whose loops wrap three sides of the spur. The ruins are overgrown, but the ditch, keep, a tower and the entrance work can still be made out. The western tower is being consolidated by the Association Arconciacum, founded in 2018.

The site is listed in the Swiss inventory of cultural property of national significance as object KGS 9594, class A. The Association Arconciacum, founded in 2018, works to preserve the medieval town site and to consolidate the castle's western tower. The ruins were still substantial enough in the early 19th century for Jean-Joseph Combaz to draw a precise plan and a view of the town entrance.