Mile Rock Lighthouse
E675521
Mile Rock Lighthouse is an offshore navigational beacon located at the entrance to San Francisco Bay, known for warning ships away from the treacherous Mile Rocks near Lands End.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Mile Rock Lighthouse canonical | 1 |
| Mile Rock Lighthouse (offshore view) | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7529484 — 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: Mile Rock Lighthouse Context triple: [Lands End, overlooks, Mile Rock Lighthouse]
-
A.
Neist Point Lighthouse
Neist Point Lighthouse is a remote, early 20th-century Scottish lighthouse perched dramatically on the westernmost tip of the Isle of Skye, guiding ships through the waters of the Inner Hebrides.
-
B.
Wind Point Lighthouse
Wind Point Lighthouse is a historic 19th-century lighthouse on Lake Michigan in Wisconsin, known as one of the oldest and tallest active lighthouses on the Great Lakes.
-
C.
McGulpin Point Lighthouse
McGulpin Point Lighthouse is a historic 19th-century lighthouse on the Straits of Mackinac in northern Michigan, preserved today as a heritage site and museum.
-
D.
Cape Schanck Lighthouse
Cape Schanck Lighthouse is a historic 19th-century coastal lighthouse on Victoria’s Mornington Peninsula, known for its dramatic cliff-top setting and maritime heritage.
-
E.
Manitowaning Lighthouse
Manitowaning Lighthouse is a historic navigational beacon on Manitoulin Island in Ontario, Canada, that once guided ships on Lake Huron.
- 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: Mile Rock Lighthouse Target entity description: Mile Rock Lighthouse is an offshore navigational beacon located at the entrance to San Francisco Bay, known for warning ships away from the treacherous Mile Rocks near Lands End.
-
A.
Neist Point Lighthouse
Neist Point Lighthouse is a remote, early 20th-century Scottish lighthouse perched dramatically on the westernmost tip of the Isle of Skye, guiding ships through the waters of the Inner Hebrides.
-
B.
Wind Point Lighthouse
Wind Point Lighthouse is a historic 19th-century lighthouse on Lake Michigan in Wisconsin, known as one of the oldest and tallest active lighthouses on the Great Lakes.
-
C.
McGulpin Point Lighthouse
McGulpin Point Lighthouse is a historic 19th-century lighthouse on the Straits of Mackinac in northern Michigan, preserved today as a heritage site and museum.
-
D.
Cape Schanck Lighthouse
Cape Schanck Lighthouse is a historic 19th-century coastal lighthouse on Victoria’s Mornington Peninsula, known for its dramatic cliff-top setting and maritime heritage.
-
E.
Manitowaning Lighthouse
Manitowaning Lighthouse is a historic navigational beacon on Manitoulin Island in Ontario, Canada, that once guided ships on Lake Huron.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
lighthouse
ⓘ
navigational aid ⓘ offshore lighthouse ⓘ |
| access | only by boat ⓘ |
| automated | 1966 ⓘ |
| bodyOfWater |
Pacific Ocean
NERFINISHED
ⓘ
San Francisco Bay NERFINISHED ⓘ |
| category |
Buildings and structures in San Francisco
ⓘ
Lighthouses in California ⓘ Transportation in the San Francisco Bay Area ⓘ |
| constructionStartDate | 1905 ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| deactivated | 1966 ⓘ |
| foundation | concrete and steel caisson ⓘ |
| function | navigational beacon ⓘ |
| hazardMarked | Mile Rocks NERFINISHED ⓘ |
| heritageStatus | historic lighthouse ⓘ |
| inception | 1906 ⓘ |
| lightCharacteristic | flashing white light ⓘ |
| locatedIn |
California, United States
ⓘ
surface form:
California
Pacific Ocean ⓘ San Francisco Bay NERFINISHED ⓘ off the coast of San Francisco ⓘ |
| locatedInProtectedArea | Golden Gate National Recreation Area NERFINISHED ⓘ |
| locatedNear |
Golden Gate
NERFINISHED
ⓘ
Lands End NERFINISHED ⓘ Mile Rocks NERFINISHED ⓘ |
| locatedOff | Lands End NERFINISHED ⓘ |
| locatedOn | Mile Rock NERFINISHED ⓘ |
| locatedWestOf | Golden Gate Bridge NERFINISHED ⓘ |
| managedBy | United States Coast Guard NERFINISHED ⓘ |
| marking | white tower with red band (historical) ⓘ |
| material |
concrete
ⓘ
steel ⓘ |
| navigationArea | approaches to the Golden Gate ⓘ |
| nearCity | San Francisco NERFINISHED ⓘ |
| notableFor |
location at the entrance to San Francisco Bay
ⓘ
warning ships away from treacherous Mile Rocks ⓘ |
| partOf | navigational system of San Francisco Bay ⓘ |
| purpose |
aid navigation at the entrance to San Francisco Bay
ⓘ
warn ships away from Mile Rocks ⓘ |
| region | Northern California ⓘ |
| status | active aid to navigation (lighted structure remains) ⓘ |
| towerShape | cylindrical tower ⓘ |
| yearLit | 1906 ⓘ |
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: Mile Rock Lighthouse Description of subject: Mile Rock Lighthouse is an offshore navigational beacon located at the entrance to San Francisco Bay, known for warning ships away from the treacherous Mile Rocks near Lands End.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.