Črni Kal (pronounced [ˈtʃəɾni ˈkaːu̯]; Italian: San Sergio) is a village in southwestern Slovenia in the City Municipality of Koper.

It stands on the lower edge of the village core and is made of chiseled limestone and marlstone blocks.

The older building is the main house, with Romanesque as well as late-Gothic features.

[4] The local church is dedicated to Saint Lawrence and belongs to the Parish of Predloka.

[5] The church's bell tower leans to the west, deviating from the vertical by more than a meter.