São Luís Island
island in Brazil
São Luís Island also known as Upaon-Açu Island (officially) or Maranhão Island is an island in the state of Maranhão, Brazil with an area of 1,412.4 km2 (545 sq mi), located between the Baía de São Marcos and the Baía de São José. There are four cities located in the island: São Luís, after which the island is named, São José de Ribamar, Paço do Lumiar, and Raposa. The city of São Luís also covers three more minor islands, Tauá Mirim, Tauá, and Medo. Raposa also has an island. The population of these four cities according to the mid 2021 estimate is 1,453,128, up from 1,309,330 at the 2010 Census.
São Luís is the capital of the state. The Island was originally named Upaon-Açu (meaning "Big Island" in the Tupi language) by the native inhabitants of the island. It is the most populous island in South America, and is reckoned among the 50 most populous islands in the world, with a similar population to Sardinia or Manhattan.
History
The city of São Luis was founded in 1612 by Daniel de la Rivardière, a French officer commissioned by Henri IV of France to establish a colony in this vicinity. It was named for Henri's 8-greats-grandfather, King Saint Louis IX (1214–1270).
Begin with the source’s own compact description: “São Luís Island” is island in Brazil. The dossier treats that line as a proposition to test through Luís, Island and island, not as a finished interpretation.
Why this record matters
The phrase “island in Brazil” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
Maps, plans, fabric surveys and administrative records can establish how the site’s name, extent and function changed over time. The source revision retrieved here is dated Aug 14, 2026. The linked authority identifier is Q2709332. Authority coordinates are -2.600, -44.233. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 2021, 2010, 1612 and 1214.
Modern boundaries and familiar names can conceal earlier jurisdictions or structures that do not align with the present site. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Treat names, boundaries and functions as historically changeable. Maps, plans, inventories and administrative records can clarify what the place meant at different dates.
- Historic place names
- Jurisdictional context
- Routes into maps and plans
Contemporary maps, plans, listed-building records, estate papers and the responsible local or national archive.
Three-step research path
- Establish the record: confirm the title “São Luís Island”, its source revision and the description used here.
- Expand the search: follow São Luís Island primary sources, São Luís Island archive and Luís research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “São Luís Island”?
- Which earlier names or jurisdictions may reveal additional records?
- Which authority defined the place, boundary or structure at the relevant date?
Search terms from this dossier
This entry incorporates text from “São Luís Island” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.