Stone church, Cultural property and natural reserve in Biobío Region, Chile

The Stone Church is a natural islet off Pilicura near Buchupureo, in the Cobquecura commune of Chile's Ñuble Region. With the Islote Lobería it forms the Islote Lobería e Iglesia de Piedra Nature Sanctuary. Its name comes from a passage that runs through the large rock, a natural formation used for Catholic services.

The islet was long called Pilicura by the area's indigenous inhabitants, a Chesungun name meaning "cold stone" or "sacred stone." On 1 September 1992, the Ministry of Education declared it a nature sanctuary together with the Islote Lobería by Supreme Decree No. 544.

The name comes from a natural passage through the great rock, which has been used for Catholic services dedicated to the Virgen del Carmen. Masses are usually held on 8 December for the Immaculate Conception. Indigenous peoples called the rock formation Pilicura in Chesungun, meaning "cold stone" or "holy stone".

The islet lies off Pilicura, near Buchupureo in the Cobquecura commune, and is reached by sea; there is no road onto the rock. The passage through the rock is a natural formation, so check sea conditions before any boat approach. The site forms the Islote Lobería e Iglesia de Piedra nature sanctuary, declared in 1992.

The "church" is not a building at all: it is a rocky islet pierced by a natural passage, and Mass is held inside that gap on 8 December for the Immaculate Conception, with the Virgin of Carmen as patron. The islet was declared a nature sanctuary together with the neighbouring Islote Lobería by Supreme Decree No. 544 of 1 September 1992.