Approximate location — plotted from published sources, not a site visit, and not a guarantee of access.
Adobe and stone foundations mark Los Santos Ángeles de Guevavi, an O'odham settlement first visited by Jesuit Fathers Kino and Salvatierra in 1691. A 15-by-50-foot church built under Father Garrucho in the 1750s still stands in ruin. Disease, the 1751 Pima revolt, and Apache raids emptied the mission; it was abandoned by 1775. The ruins were donated through the Archaeological Conservancy and added to Tumacácori National Historical Park in 1990.
Cultural sites and artifacts are protected by federal law (ARPA/NHPA) — stay on established routes, touch and remove nothing, and follow the managing agency's and the affiliated tribe's guidance on access.