Alcatraz Island
E2792
Alcatraz Island is a small rocky island in San Francisco Bay best known for its former maximum-security federal prison, which once held some of America’s most notorious criminals and is now a popular historic site and tourist attraction.
All labels observed (12)
How this entity was disambiguated
This entity first appeared as the object of triple T11879 — 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: Alcatraz Island Context triple: [San Francisco, knownFor, Alcatraz Island]
-
A.
Turtle Bay
Turtle Bay is a neighborhood on Manhattan’s East Side in New York City, best known as the site of the United Nations Headquarters.
-
B.
Nantucket
Nantucket is a small, historic island and popular summer vacation destination off the coast of Massachusetts, known for its beaches, whaling-era architecture, and maritime heritage.
-
C.
Isla de Vieques
Isla de Vieques is a small Caribbean island off the eastern coast of Puerto Rico, known for its pristine beaches, wild horses, and one of the world’s brightest bioluminescent bays.
-
D.
Fisherman’s Wharf
Fisherman’s Wharf is a popular waterfront neighborhood and tourist destination in San Francisco known for its seafood restaurants, historic piers, and views of the bay and Alcatraz Island.
-
E.
Easter Island
Easter Island is a remote Polynesian island in the southeastern Pacific Ocean, famed for its monumental moai statues and distinctive Rapa Nui culture.
- 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: Alcatraz Island Target entity description: Alcatraz Island is a small rocky island in San Francisco Bay best known for its former maximum-security federal prison, which once held some of America’s most notorious criminals and is now a popular historic site and tourist attraction.
-
A.
Turtle Bay
Turtle Bay is a neighborhood on Manhattan’s East Side in New York City, best known as the site of the United Nations Headquarters.
-
B.
Nantucket
Nantucket is a small, historic island and popular summer vacation destination off the coast of Massachusetts, known for its beaches, whaling-era architecture, and maritime heritage.
-
C.
Isla de Vieques
Isla de Vieques is a small Caribbean island off the eastern coast of Puerto Rico, known for its pristine beaches, wild horses, and one of the world’s brightest bioluminescent bays.
-
D.
Fisherman’s Wharf
Fisherman’s Wharf is a popular waterfront neighborhood and tourist destination in San Francisco known for its seafood restaurants, historic piers, and views of the bay and Alcatraz Island.
-
E.
Easter Island
Easter Island is a remote Polynesian island in the southeastern Pacific Ocean, famed for its monumental moai statues and distinctive Rapa Nui culture.
- F. None of above. chosen
Statements (63)
| Predicate | Object |
|---|---|
| instanceOf |
former prison site
ⓘ
historic site ⓘ island ⓘ tourist attraction ⓘ |
| accessibleBy | ferry ⓘ |
| administeredBy | National Park Service ⓘ |
| area | approximately 22 acres ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| designation | National Historic Landmark ⓘ |
| designationYear | 1986 ⓘ |
| discoveredByEuropeans | Juan Manuel de Ayala ⓘ |
| distanceFrom | about 1.25 miles from San Francisco ⓘ |
| ecosystem | seabird nesting habitat ⓘ |
| elevation | 41 meters ⓘ |
| featuredIn |
film "Escape from Alcatraz"
ⓘ
film "The Rock" ⓘ |
| federalPenitentiaryClosed | 1963 ⓘ |
| federalPenitentiaryOpened | 1934 ⓘ |
| ferryOperator | Alcatraz City Cruises ⓘ |
| formerUsePeriod |
U.S. Army military prison from late 19th century to 1933
ⓘ
federal penitentiary from 1934 to 1963 ⓘ military fortification in the 19th century ⓘ |
| governedBy | City and County of San Francisco jurisdiction ⓘ |
| hasFacility |
Alcatraz Island
self-linksurface differs
ⓘ
surface form:
Alcatraz Federal Penitentiary
Alcatraz Island Lighthouse ⓘ cellhouse ⓘ dock ⓘ military fortifications ⓘ power plant ⓘ recreation yard ⓘ warden's house ⓘ |
| hasFeature |
rocky terrain
ⓘ
steep cliffs ⓘ surrounding cold strong currents ⓘ |
| hasLighthouse | Alcatraz Island Lighthouse ⓘ |
| hasStatus | National Historic Landmark ⓘ |
| hasWildlife |
cormorants
ⓘ
egrets ⓘ western gulls ⓘ |
| lighthouseFirstLit | 1854 ⓘ |
| lighthouseRebuilt | 1909 ⓘ |
| locatedIn |
California, United States
ⓘ
surface form:
California
San Francisco Bay ⓘ United States of America ⓘ
surface form:
United States
|
| managedBy | National Park Service since 1972 ⓘ |
| namedBy | Juan Manuel de Ayala ⓘ |
| nameOrigin | Spanish name "La Isla de los Alcatraces" ⓘ |
| nearestCity | San Francisco ⓘ |
| notableEvent |
1962 escape attempt by Frank Morris and the Anglin brothers
ⓘ
Native American occupation from 1969 to 1971 ⓘ |
| notableInmateHeld |
Al Capone
ⓘ
Alvin Karpis ⓘ George "Machine Gun" Kelly ⓘ Robert Stroud ⓘ |
| openToPublic | yes ⓘ |
| partOf |
Golden Gate National Recreation Area
ⓘ
Golden Gate National Recreation Area since 1972 ⓘ San Francisco Bay ⓘ |
| touristAttractionSince | 1973 ⓘ |
| usedAs |
federal penitentiary
ⓘ
lighthouse station ⓘ military fortification ⓘ military prison ⓘ |
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: Alcatraz Island Description of subject: Alcatraz Island is a small rocky island in San Francisco Bay best known for its former maximum-security federal prison, which once held some of America’s most notorious criminals and is now a popular historic site and tourist attraction.
Referenced by (121)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Major Baxter
this entity surface form:
Alcatraz
this entity surface form:
Alcatraz
this entity surface form:
Alcatraz
this entity surface form:
Alcatraz
subject surface form:
Frank Lee Morris
this entity surface form:
Alcatraz Federal Penitentiary
subject surface form:
Frank Lee Morris
this entity surface form:
Alcatraz Federal Penitentiary
this entity surface form:
Alcatraz Federal Penitentiary
subject surface form:
John Anglin
this entity surface form:
Alcatraz Federal Penitentiary
subject surface form:
John Anglin
this entity surface form:
Alcatraz Island, San Francisco Bay
this entity surface form:
Alcatraz Federal Penitentiary
this entity surface form:
Alcatraz
this entity surface form:
Alcatraz Federal Penitentiary
subject surface form:
John Anglin
this entity surface form:
Alcatraz Federal Penitentiary
subject surface form:
1962 Alcatraz escape
this entity surface form:
Alcatraz Federal Penitentiary
this entity surface form:
Alcatraz Federal Penitentiary
this entity surface form:
Alcatraz Federal Penitentiary