Whaleback Lighthouse
E939921
Whaleback Lighthouse is a historic offshore beacon located at the mouth of the Piscataqua River, guiding ships entering Portsmouth Harbor between Maine and New Hampshire.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Whaleback Light (nearby lighthouse) | 1 |
| Whaleback Lighthouse canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T11589891 — 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: Whaleback Lighthouse Context triple: [Portsmouth Harbor, hasPart, Whaleback Lighthouse]
-
A.
Brown’s Point Lighthouse
Brown’s Point Lighthouse is a historic navigational beacon on Puget Sound in Tacoma, Washington, known for guiding maritime traffic and its preserved keeper’s cottage.
-
B.
Jones Point Lighthouse
Jones Point Lighthouse is a historic 19th-century river lighthouse located on the Potomac River near Alexandria, Virginia, notable as one of the last remaining riverine lighthouses in the United States.
-
C.
Peggy’s Point Lighthouse
Peggy’s Point Lighthouse is an iconic red-and-white coastal beacon in Nova Scotia, Canada, famed as one of the country’s most photographed and visited lighthouses.
-
D.
Sankaty Head Light
Sankaty Head Light is a historic lighthouse on the eastern shore of Nantucket, Massachusetts, known for guiding ships along the treacherous waters off the island since the mid-19th century.
-
E.
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.
- 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: Whaleback Lighthouse Target entity description: Whaleback Lighthouse is a historic offshore beacon located at the mouth of the Piscataqua River, guiding ships entering Portsmouth Harbor between Maine and New Hampshire.
-
A.
Brown’s Point Lighthouse
Brown’s Point Lighthouse is a historic navigational beacon on Puget Sound in Tacoma, Washington, known for guiding maritime traffic and its preserved keeper’s cottage.
-
B.
Jones Point Lighthouse
Jones Point Lighthouse is a historic 19th-century river lighthouse located on the Potomac River near Alexandria, Virginia, notable as one of the last remaining riverine lighthouses in the United States.
-
C.
Peggy’s Point Lighthouse
Peggy’s Point Lighthouse is an iconic red-and-white coastal beacon in Nova Scotia, Canada, famed as one of the country’s most photographed and visited lighthouses.
-
D.
Sankaty Head Light
Sankaty Head Light is a historic lighthouse on the eastern shore of Nantucket, Massachusetts, known for guiding ships along the treacherous waters off the island since the mid-19th century.
-
E.
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.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
historic place
ⓘ
lighthouse ⓘ offshore lighthouse ⓘ |
| access | only by boat ⓘ |
| associatedWith |
Kittery, Maine coastline
NERFINISHED
ⓘ
Portsmouth, New Hampshire maritime traffic ⓘ |
| automated | yes ⓘ |
| category |
Lighthouses in Maine
ⓘ
Lighthouses on the National Register of Historic Places in Maine ⓘ |
| constructionMaterial | granite ⓘ |
| coordinates | approximately 43.065°N 70.696°W ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| focalHeight | about 59 feet ⓘ |
| foundation | granite pier ⓘ |
| hasFogSignal | yes ⓘ |
| hasNameOrigin | named for the whale-like shape of the ledge on which it stands ⓘ |
| height | about 50 feet ⓘ |
| historicSignificance | one of the early 19th-century offshore lighthouses in New England ⓘ |
| isOffshore | true ⓘ |
| lightCharacteristic | flashing white light ⓘ |
| lightRange | about 12 nautical miles ⓘ |
| locatedIn |
Gulf of Maine
NERFINISHED
ⓘ
New England ⓘ Portsmouth Harbor NERFINISHED ⓘ United States of America ⓘ
surface form:
United States
mouth of the Piscataqua River ⓘ |
| locatedNear |
Kittery, Maine
NERFINISHED
ⓘ
New Castle, New Hampshire NERFINISHED ⓘ |
| locatedOn | rocky ledge known as Whaleback Ledge NERFINISHED ⓘ |
| managedBy | United States Coast Guard NERFINISHED ⓘ |
| marking | unpainted granite tower ⓘ |
| navigationalAuthority | United States Coast Guard Aids to Navigation System NERFINISHED ⓘ |
| nearIsland | Whaleback Ledge NERFINISHED ⓘ |
| nearWaterBody |
Atlantic Ocean
NERFINISHED
ⓘ
Piscataqua River NERFINISHED ⓘ |
| originalLensType | Fresnel lens NERFINISHED ⓘ |
| ownedBy | United States government ⓘ |
| purpose |
aid to navigation
ⓘ
guide ships entering Portsmouth Harbor ⓘ |
| region | York County, Maine NERFINISHED ⓘ |
| servesHarbor | Portsmouth Harbor NERFINISHED ⓘ |
| state | Maine ⓘ |
| stateBorder | New Hampshire NERFINISHED ⓘ |
| towerShape | conical tower ⓘ |
| yearLit | 1830 ⓘ |
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: Whaleback Lighthouse Description of subject: Whaleback Lighthouse is a historic offshore beacon located at the mouth of the Piscataqua River, guiding ships entering Portsmouth Harbor between Maine and New Hampshire.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Whaleback Light (nearby lighthouse)