Arroyo Las Positas
E949654
Arroyo Las Positas is a stream in Alameda County, California, that drains much of the Livermore Valley before joining larger waterways in the region.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Arroyo Las Positas canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T11800246 — 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: Arroyo Las Positas Context triple: [Livermore Valley, drainageBasinOf, Arroyo Las Positas]
-
A.
San Jose Creek
San Jose Creek is a waterway in Southern California that drains parts of the San Gabriel Valley before joining the San Gabriel River.
-
B.
San Mateo Creek
San Mateo Creek is a waterway in San Mateo County, California, that drains the Crystal Springs Reservoir and flows toward San Francisco Bay.
-
C.
Purisima Creek
Purisima Creek is a forested stream in the Santa Cruz Mountains of California, known for running through redwood canyons and providing scenic trails and habitat within the Purisima Creek Redwoods Open Space Preserve.
-
D.
Moraga Creek
Moraga Creek is a small waterway in Contra Costa County, California, that flows through the town of Moraga and contributes to the local watershed and natural landscape.
-
E.
San Lorenzo Creek
San Lorenzo Creek is a stream in central California that serves as a significant tributary within the Salinas River watershed.
- 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: Arroyo Las Positas Target entity description: Arroyo Las Positas is a stream in Alameda County, California, that drains much of the Livermore Valley before joining larger waterways in the region.
-
A.
San Jose Creek
San Jose Creek is a waterway in Southern California that drains parts of the San Gabriel Valley before joining the San Gabriel River.
-
B.
San Mateo Creek
San Mateo Creek is a waterway in San Mateo County, California, that drains the Crystal Springs Reservoir and flows toward San Francisco Bay.
-
C.
Purisima Creek
Purisima Creek is a forested stream in the Santa Cruz Mountains of California, known for running through redwood canyons and providing scenic trails and habitat within the Purisima Creek Redwoods Open Space Preserve.
-
D.
Moraga Creek
Moraga Creek is a small waterway in Contra Costa County, California, that flows through the town of Moraga and contributes to the local watershed and natural landscape.
-
E.
San Lorenzo Creek
San Lorenzo Creek is a stream in central California that serves as a significant tributary within the Salinas River watershed.
- F. None of above. chosen
Statements (25)
| Predicate | Object |
|---|---|
| instanceOf |
stream
ⓘ
watercourse ⓘ |
| basinCountry |
United States
ⓘ
linked to:
United States of America
|
| country |
United States
ⓘ
linked to:
United States of America
|
| drainageBasin | Livermore Valley ⓘ |
| drains | Livermore Valley ⓘ |
| flowsThrough |
Livermore, California
ⓘ
linked to:
Livermore
|
| hasEnvironmentalSignificance |
contributes to regional groundwater recharge (locally)
ⓘ
conveys stormwater from Livermore Valley ⓘ |
| hasMouthLocatedIn |
Alameda County, California
ⓘ
linked to:
Alameda County
|
| hydrologicalRole | local drainage for Livermore Valley ⓘ |
| languageOfName | Spanish ⓘ |
| locatedIn |
Alameda County, California
ⓘ
linked to:
Alameda County
California ⓘ
linked to:
California, United States
East Bay region of the San Francisco Bay Area ⓘ
linked to:
East Bay
Livermore Valley ⓘ |
| locatedNear |
Altamont Pass area (regional context)
ⓘ
linked to:
Altamont Pass
Diablo Range (to the east and south of Livermore Valley) ⓘ |
| nameMeaning | little pools creek ⓘ |
| partOf |
local surface water system of Alameda County
ⓘ
watershed of the Livermore Valley ⓘ |
| region | Northern California ⓘ |
| tributaryOf |
Arroyo Mocho
ⓘ
larger regional waterways in Alameda County ⓘ |
| watercourseType | intermittent stream (in parts) ⓘ |
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: Arroyo Las Positas Description of subject: Arroyo Las Positas is a stream in Alameda County, California, that drains much of the Livermore Valley before joining larger waterways in the region.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.