Birtvisi Natural Monument (Georgian: ბირთვისის კლდეები) is a rocky landscape 5 km to the north from village Tbisi in the Tetritsqaro Municipality in Kvemo Kartli region of Georgia,[1] adjacent to the Algeti National Park, south-west of the nation's capital Tbilisi.

[3] Scenic landscape with volcanic rocks [4] in the gorge of Algeti River belongs to outskirts of Trialeti Range.

Formidable natural obstacles of canyons [5] and cliffs provided ideal location for historic Birtvisi Fortress, now in ruins.

Birtvisi Fortress 6-7 km access road starts at the east of the village Partskhisi.

[3] Birtvisi Natural Monument is managed by Algeti National Park administration.