|• Total||1.47 km2 (0.57 sq mi)|
|Elevation||252.9 m (829.7 ft)|
Črni Kal (pronounced [ˈtʃəɾni ˈkaːu̯]; Italian: San Sergio) is a village in southwestern Slovenia in the City Municipality of Koper. It is best known today for the Črni Kal Viaduct, the longest and the highest viaduct in Slovenia.
The village has some good examples of traditional Karst architecture. One such monument is the Benko House, built in 1489 by stonemasons Andrej (Andrew) and Benko (Benjamin) as indicated by an inscription on the building: Andreas et Benco construxerunt. This makes it oldest surviving farmhouse in the Koper area and is also the oldest signed and dated secular building in all of Slovenia. It stands on the lower edge of the village core and is made of chiseled limestone and marlstone blocks. It comprises two buildings with inscriptions in the Glagolitic alphabet on the facade. The older building is the main house, with Romanesque as well as late-Gothic features.