Hrastovlje (pronounced [xɾaˈstoːu̯ljɛ] ⓘ; Italian: Cristoglie,[2][3] German: Chrästeirach[citation needed]) is a village in the City Municipality of Koper in the Littoral region of Slovenia.

[5] Hrastovlje is also the location of the only major spring in Slovenian Istria, the karst spring of the Rižana River, which is itself the most important source of water supply for the Slovenian coastal area[6] and part of the habitat range of the marbled trout listed on the IUCN Red List.

[7] It is a stone-built church, typical of the area, and stands on a small hill above the village inside a walled enclosure 8 m high.

The encampment wall, built in the late 15th and early 16th centuries, is an irregular rectangle with cylindrical towers in exposed corners.

Scenes from the Book of Genesis also decorate the nave, images of the Apostles are painted in niches in the apse, with other saints and prophets as well as a Passion series and the journey and adoration of the Magi.