Thitu Island
Island in the Philippines
Thitu Island, also known as Pag-asa Island (Filipino: Pulo ng Pag-asa, lit. 'Island of Hope'), Đảo Thị Tứ (Vietnamese: Đảo Thị Tứ), and Zhongye Island (Chinese: 中业岛/中業島; pinyin: Zhōngyè Dǎo), is the second largest of the naturally occurring islands in the Spratly Islands, having an area of 37.2 hectares (92 acres). It lies about 500 kilometers (310 mi) west of Puerto Princesa. Its neighbors are the North Danger Reef to the north, Subi Reef to the southwest, and the Loaita and Tizard Banks to the south. The island serves as the administrative center of the Kalayaan municipality of Palawan province in the Philippines; it also administers nearly a dozen other islets, cays, and reefs in the Spratlys. Thitu is 270 nautical miles (500 km; 310 mi) west of Palawan.
In 1971, following a typhoon, the island was seized by the Philippines from Taiwan.
In May 2020, a new sheltered port and harbor were built on the island, as well as a beaching ramp at the tip of the airstrip. In early 2023, the runway was paved in concrete. Civilian infrastructure on the island includes the airstrip, a lighthouse, a clinic, a communication tower, and a small integrated elementary and high school.
Thitu is the largest of the Philippine-administered islands in the Spratlys.
Begin with the source’s own compact description: “Thitu Island” is island in the Philippines. The dossier treats that line as a proposition to test through Thitu, Island and Philippines, not as a finished interpretation.
Why this record matters
The phrase “island in the Philippines” 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.
The strongest evidence will usually combine a dated visual record with documents produced by the authority responsible for the place. The source revision retrieved here is dated Sep 24, 2026. The linked authority identifier is Q2232625. Authority coordinates are 11.052, 114.283. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1971, 2020 and 2023.
Modern boundaries and familiar names can conceal earlier jurisdictions or structures that do not align with the present site. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. 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 “Thitu Island”, its source revision and the description used here.
- Expand the search: follow Thitu Island primary sources, Thitu Island archive and Thitu 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 “Thitu 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 “Thitu 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.