The Monastery of the Virgin Mary of the Great Cave is located in the mountainous Kalavrita within 10 kilometres from the town of Kalavrita. The ground format is what gave the Monastery its name, with a huge rock standing as a vigil guard while in the bottom spreads the valley of Vouraikos.

It is built at a height of 924 metres, in the cave of the root of a huge rock, depth of 30 metres, 60 metres in height and width of 60 metres.
The position of the monastery is an excellent advantage to anyone who conspire against, resulting in non-conquest by foreigners during the entire history.
The monastery has over eighty cells divided into floors, with Monastery of the Virgin Mary being on the third floor, painted by the priest M. Andronicus.