The term "Rua do Guarda-Mor" does not appear to correspond to a widely recognized or documented location, concept, or entity in publicly available encyclopedic sources. It is not associated with any prominent geographical, historical, or cultural reference that is verifiable through reliable references.
"Rua" is the Portuguese word for "street," commonly used in street names in Portuguese-speaking countries such as Portugal, Brazil, and others. "Guarda-Mor" translates to "chief guard" or "head warden," a historical title that may have referred to a senior official or officer in a royal or military context, particularly during the Portuguese Empire.
Therefore, "Rua do Guarda-Mor" could plausibly be the name of a street, possibly in Portugal or another Lusophone country, named in reference to a historical figure or position. However, accurate information about its location, significance, or existence is not confirmed. The term does not appear in major geographic or reference databases as of the current knowledge base.