Pedra Branca
E669028
Pedra Branca is a small but strategically important rocky outcrop at the eastern entrance of the Singapore Strait, long contested between Singapore and Malaysia due to its location and the presence of the Horsburgh Lighthouse.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Pedra Branca canonical | 5 |
How this entity was disambiguated
This entity first appeared as the object of triple T7508756 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Pedra Branca Context triple: [Singapore–Malaysia border, disputedFeature, Pedra Branca]
-
A.
Redang Island
Redang Island is a popular Malaysian tropical island in the South China Sea, renowned for its white-sand beaches, clear turquoise waters, and vibrant coral reefs that attract snorkelers and divers.
-
B.
Bunga Head
Bunga Head is a coastal headland within Mimosa Rocks National Park on the south coast of New South Wales, Australia, known for its rugged shoreline and scenic ocean views.
-
C.
Jabat Island
Jabat Island is a small coral island in the Ralik Chain of the Marshall Islands in the central Pacific Ocean.
-
D.
Macan Island
Macan Island is a small eco-resort island in Indonesia’s Thousand Islands archipelago, known for its overwater bungalows, clear waters, and marine activities near Jakarta.
-
E.
Sipadan Island
Sipadan Island is a renowned Malaysian oceanic island in the Celebes Sea, famous for its rich marine biodiversity and world-class scuba diving sites.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Pedra Branca Target entity description: Pedra Branca is a small but strategically important rocky outcrop at the eastern entrance of the Singapore Strait, long contested between Singapore and Malaysia due to its location and the presence of the Horsburgh Lighthouse.
-
A.
Redang Island
Redang Island is a popular Malaysian tropical island in the South China Sea, renowned for its white-sand beaches, clear turquoise waters, and vibrant coral reefs that attract snorkelers and divers.
-
B.
Bunga Head
Bunga Head is a coastal headland within Mimosa Rocks National Park on the south coast of New South Wales, Australia, known for its rugged shoreline and scenic ocean views.
-
C.
Jabat Island
Jabat Island is a small coral island in the Ralik Chain of the Marshall Islands in the central Pacific Ocean.
-
D.
Macan Island
Macan Island is a small eco-resort island in Indonesia’s Thousand Islands archipelago, known for its overwater bungalows, clear waters, and marine activities near Jakarta.
-
E.
Sipadan Island
Sipadan Island is a renowned Malaysian oceanic island in the Celebes Sea, famous for its rich marine biodiversity and world-class scuba diving sites.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
island
ⓘ
lighthouse ⓘ maritime feature ⓘ rocky outcrop ⓘ |
| administeredBy |
Maritime and Port Authority of Singapore
ⓘ
Singapore Navy ⓘ
linked to:
Republic of Singapore Navy
|
| constructedBy | British colonial authorities ⓘ |
| constructionCompleted | 1851 ⓘ |
| country | Singapore ⓘ |
| disputedBy |
Malaysia
ⓘ
Singapore ⓘ |
| distanceFromMalaysia | about 14 kilometres off the coast of Johor ⓘ |
| distanceFromSingapore | about 44 kilometres east of mainland Singapore ⓘ |
| elevation | about 7 to 8 metres above sea level ⓘ |
| geologicalType | granite outcrop ⓘ |
| hasAlternativeName |
Pulau Batu Puteh
ⓘ
White Rock ⓘ |
| hasLegalCase |
Sovereignty over Pedra Branca, Middle Rocks and South Ledge (Malaysia v. Singapore)
ⓘ
linked to:
Sovereignty over Pedra Branca case
|
| hasLighthouse | Horsburgh Lighthouse ⓘ |
| hasNoFreshWater | true ⓘ |
| hasStructure | communications and radar facilities ⓘ |
| historicalAdminBy |
British Straits Settlements
ⓘ
linked to:
Straits Settlements
|
| ICJJudgmentDate | 23 May 2008 ⓘ |
| ICJJudgmentOutcome |
Middle Rocks awarded to Malaysia
ⓘ
sovereignty awarded to Singapore ⓘ sovereignty over South Ledge dependent on territorial waters delimitation ⓘ |
| ICJRevisionApplicationWithdrawnBy | Malaysia in 2018 ⓘ |
| importantFor | safety of navigation in Singapore Strait ⓘ |
| legalCaseDecidedBy | International Court of Justice ⓘ |
| lighthouseName | Horsburgh Lighthouse ⓘ |
| locatedAt | eastern entrance of the Singapore Strait ⓘ |
| locatedIn |
Singapore Strait
ⓘ
South China Sea ⓘ |
| locatedOn | Pedra Branca ⓘ |
| namedAfter | James Horsburgh ⓘ |
| nameLanguage | Portuguese ⓘ |
| nameMeaning | white rock in Portuguese ⓘ |
| nearbyFeature |
Middle Rocks
ⓘ
South Ledge ⓘ |
| region | Southeast Asia ⓘ |
| sovereigntyClaimedBy | Singapore ⓘ |
| sovereigntyPreviouslyClaimedBy | Malaysia ⓘ |
| strategicImportance |
controls access to Singapore Strait shipping lanes
ⓘ
navigation aid for international shipping ⓘ |
| subjectOf |
Malaysia’s 2017 application for revision of ICJ judgment
ⓘ
Malaysia’s 2017 request for interpretation of ICJ judgment ⓘ |
| uninhabited | true ⓘ |
| usedFor |
maritime navigation
ⓘ
monitoring shipping traffic ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Pedra Branca Description of subject: Pedra Branca is a small but strategically important rocky outcrop at the eastern entrance of the Singapore Strait, long contested between Singapore and Malaysia due to its location and the presence of the Horsburgh Lighthouse.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.