Birtvisi Natural Monument () is a rocky landscape 5 km to the north from village in the Tetritsqaro Municipality in Kvemo Kartli region of Georgia, adjacent to the Algeti National Park, south-west of the nation's capital Tbilisi. Birtvisi rocks elevation 950-1050 meters above sea level. Scenic landscape with volcanic rocks in the gorge of Algeti River belongs to outskirts of Trialeti Range. Formidable natural obstacles of canyons and cliffs provided ideal location for historic Birtvisi Fortress, now in ruins. Birtvisi Fortress 6âÂÂ7 km access road starts at the east of the village .
Birtvisi Natural Monument is managed by Algeti National Park administration.