Okertalsperre
E312138
Okertalsperre is a large reservoir and dam complex in Germany’s Harz Mountains, used for hydroelectric power generation, flood control, and recreation.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Okertalsperre canonical | 2 |
| Okertalsperre reservoir | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2938259 — 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: Okertalsperre Context triple: [Oker, flowsPast, Okertalsperre]
-
A.
Sorpe Dam
The Sorpe Dam is a German earth-fill dam in the Ruhr region that was a key target of the RAF’s World War II “Dambusters” raid, Operation Chastise.
-
B.
Bütgenbach Dam
Bütgenbach Dam is a hydroelectric and flood-control structure in eastern Belgium that creates Lake Bütgenbach, a popular site for recreation and water sports.
-
C.
Jurala Dam
Jurala Dam is a major irrigation and hydroelectric project built across the Krishna River in Telangana, India.
-
D.
Eder Dam
Eder Dam is a major German gravity dam in the Eder River valley, historically known for being one of the dams breached by the RAF’s “Dambusters” raid during World War II.
-
E.
Grandval Dam
Grandval Dam is a large hydroelectric dam in southern France, known for impounding the Truyère River to form the Lac de Grandval reservoir.
- 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: Okertalsperre Target entity description: Okertalsperre is a large reservoir and dam complex in Germany’s Harz Mountains, used for hydroelectric power generation, flood control, and recreation.
-
A.
Sorpe Dam
The Sorpe Dam is a German earth-fill dam in the Ruhr region that was a key target of the RAF’s World War II “Dambusters” raid, Operation Chastise.
-
B.
Bütgenbach Dam
Bütgenbach Dam is a hydroelectric and flood-control structure in eastern Belgium that creates Lake Bütgenbach, a popular site for recreation and water sports.
-
C.
Jurala Dam
Jurala Dam is a major irrigation and hydroelectric project built across the Krishna River in Telangana, India.
-
D.
Eder Dam
Eder Dam is a major German gravity dam in the Eder River valley, historically known for being one of the dams breached by the RAF’s “Dambusters” raid during World War II.
-
E.
Grandval Dam
Grandval Dam is a large hydroelectric dam in southern France, known for impounding the Truyère River to form the Lac de Grandval reservoir.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
dam
ⓘ
reservoir ⓘ |
| catchmentArea | approximately 85 km² ⓘ |
| constructionEndDate | 1956 ⓘ |
| constructionStartDate | 1938 ⓘ |
| continent | Europe ⓘ |
| country | Germany ⓘ |
| crosses |
Oker valley
ⓘ
surface form:
Oker Valley
|
| damHeight | about 75 m ⓘ |
| damLength | about 260 m ⓘ |
| damType | concrete gravity dam ⓘ |
| designedFor |
low-water regulation of the Oker
ⓘ
protection against flooding on the Oker ⓘ |
| elevationAboveSeaLevel | about 420 m ⓘ |
| hasHydroelectricPlant | Okertalsperre power station ⓘ |
| hasPart |
Oker Dam
ⓘ
Pre-dam of Okertalsperre ⓘ |
| hasRecreationalFacility |
boat rental
ⓘ
hiking trails around reservoir ⓘ |
| hasRoadOnCrest | yes ⓘ |
| hasViewpoint | dam crest viewpoint ⓘ |
| isPartOf |
UNESCO World Heritage Site Upper Harz Water Management System
ⓘ
surface form:
Harz water management system
|
| length | approximately 2600 m ⓘ |
| locatedIn |
District of Goslar
ⓘ
surface form:
Goslar district
Harz ⓘ
surface form:
Harz Mountains
Lower Saxony ⓘ |
| locatedInProtectedArea |
Harz National Park
ⓘ
surface form:
Harz nature park
|
| nearbySettlement |
Altenau
ⓘ
Goslar ⓘ Schulenberg im Oberharz ⓘ |
| openingDate | 1956 ⓘ |
| operator |
Harzwasserwerke GmbH
ⓘ
surface form:
Harzwasserwerke
|
| purpose |
drinking water supply
ⓘ
flood control ⓘ hydroelectric power generation ⓘ recreation ⓘ |
| region | Harz ⓘ |
| river | Oker ⓘ |
| state | Lower Saxony ⓘ |
| surfaceArea | approximately 2.25 km² ⓘ |
| totalCapacity | approximately 46 million m³ ⓘ |
| usedFor |
fishing
ⓘ
rowing ⓘ sailing ⓘ swimming ⓘ tourism ⓘ |
| waterBodyType | artificial lake ⓘ |
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: Okertalsperre Description of subject: Okertalsperre is a large reservoir and dam complex in Germany’s Harz Mountains, used for hydroelectric power generation, flood control, and recreation.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Okertalsperre reservoir