At Itá-Cuá on the Paraguayan bank of the Alto Paraná, Juan B. Ambrosetti reported seeing worshippers and many lighted candles in January 1892. He asked a fellow traveller why the rocks were venerated and received an apparition story already described by Eduardo Holmberg. The account preserves a proposed explanation involving the shape of a fissure, while the modern shrine continues a much broader tradition of Marian devotion.
The nineteenth-century source
The principal reviewed text is Ambrosetti’s Supersticiones y leyendas, 1917, printed pages 109–112. He identifies Itá-Cuá as rocks close to the Paraguayan shore, near Encarnación and across the river region from Posadas. The narrative concerns this riverside place, rather than every Paraguayan location with a similar name.
Ambrosetti quotes a passage from Holmberg’s Viaje a Misiones, citing the 1887 publication, chapter XXI, page 358. In it, Holmberg approaches the rocks by canoe intending to examine them. Before he arrives, the boatmen tell him why the place has become associated with an appearance of the Virgin Mary. The apparition account is therefore introduced as a story told to a traveller.
This article reviews Holmberg’s passage as reproduced by Ambrosetti, rather than claiming a separate examination of the entire 1887 volume. The two names in the later book do not automatically mean two independent witnessed apparitions. Their roles and the source chain remain visible in the text.
The shape in the opening
In the story, someone looking through a crack from the eastern side saw a white figure interpreted as the Virgin on the opposite side. Its appearance was described as unpredictable. A further observer was said to have examined the rocks and found that an opening or fissure imitated the outline of the Immaculate Conception.
The quoted account then suggests that vegetation could alter the projected outline: branches or grasses obstructed its form when present and left it clearer when absent. This supplies a specific natural proposal for an appearance that did not always look the same. It does not document a modern experiment with measured lighting, viewing geometry and photographs.
When Holmberg asked whether they would be able to see the image, a boatman answered, in effect, that a believer sees what he wishes to see. Ambrosetti accepted the fissure explanation as the reason behind the legend. The boatman’s remark and the collector’s confidence are part of the historical discussion; they are not measurements demonstrating what every devotee experienced.
Ambrosetti’s visit in January 1892
Ambrosetti supplies a firmer date for his own passage past the place. He was returning from his first Misiones expedition, having crossed between the Uruguay and Paraná river systems, when he travelled downstream in January 1892. He says the women on the rocks and the many burning candles caught his attention.
He asked Joaquín Aramburú, a long-established Posadas resident and yerba trader travelling on the same steamer, about them. According to Ambrosetti, Aramburú related the same explanation that Holmberg had recorded. This supports the circulation of the story and the presence of devotion at that time. Ambrosetti does not say that he personally saw an apparition on that journey.
The difference is central to the case. January 1892 dates a described observation of people, candles and a conversation. It does not date the original apparition or prove that an image appeared while the steamer passed. The early account is valuable without giving it a stronger claim than its author actually made.
Offerings and the collector’s interpretation
The surveyor Juan Queirel later told Ambrosetti of an offering custom at the rocks, particularly among canoe travellers. People praying and lighting candles left money or small useful objects, such as fishing hooks or provisions. The idea was that a later visitor could take the offering and pray for the person who had left it.
That is an account of a social and devotional practice, transmitted through another named informant. It does not establish the origin of every offering or verify supernatural protection for a voyage. The source’s discussion of travellers seeking help should remain distinct from a record of measured changes in river safety.
Ambrosetti attributed the tradition’s origin to the Jesuit period with considerable confidence, but the passage does not reproduce an early foundation document establishing that claim. He also interpreted local belief through the assumptions and language of his own period. Those judgements are attributed to him rather than adopted as a complete account of the community’s religious history.
The modern shrine
The municipality’s present account links the Virgen de Itacuá with navigators seeking protection among rocks. It says a European image was installed in a grotto through missionary efforts in the early twentieth century. That later statue history need not be confused with the earlier devotion Ambrosetti described in 1892.
The municipal page also confirms daily visitors, paths and the paved Tupasy Rapé approach. A 10 November 2026 municipal notice records preparations for the annual pilgrimage. These sources support the site’s present public religious and visitor function. They do not independently confirm a nineteenth-century apparition or prove the proposed optical explanation.
Assessment and map reference
The outcome is Possibly Explained for the historical visual-appearance story. The reproduced Holmberg passage describes an opening resembling a familiar religious outline and vegetation affecting its appearance. That is a specific proposed natural explanation. The reviewed material lacks the documented viewing reconstruction needed to establish it conclusively for a particular apparition report.
The broader devotion is well documented as a historical and continuing practice. Its existence does not depend on treating every associated story as the same kind of evidence. The case therefore retains Ambrosetti’s dated observation, the older reported appearance, the proposed fissure explanation and current access as separate parts of the record.
The map uses an approximate present shrine-area reference of −27.4122, −55.8171, from the map link in SENATUR’s official visitor listing. It does not identify a nineteenth-century viewing crack, exact candle position or unchanged historical shoreline. The country is Paraguay, the department Itapúa and the current time zone America/Asuncion. The year entry is 1892 for Ambrosetti’s documented visit; the original apparition remains undated.
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Municipalityconfirms dailyvisitors,pavedTupasyRapeapproach,shrinepaths. 10Nov2026officialpilgrimagepreparationsconfirmpresentvisitorfunction. Usecurrentmanagedaccess; noassumedhistoriccrack/riverrockpermission.
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