Santa Ana River
E151437
The Santa Ana River is a major waterway in Southern California that flows from the San Bernardino Mountains through inland valleys to the Pacific Ocean, shaping the region’s geography and development.
All labels observed (7)
| Label | Occurrences |
|---|---|
| Santa Ana River canonical | 33 |
| Santa Ana River watershed | 13 |
| Santa Ana River (nearby) | 1 |
| Santa Ana River area | 1 |
| Santa Ana River basin | 1 |
| Santa Ana River mouth at Huntington Beach | 1 |
| Santa Ana River near Colton, California | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T950284 — 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: Santa Ana River Context triple: [Riverside, namedFor, Santa Ana River]
-
A.
Mojave River
The Mojave River is an intermittent river in the Mojave Desert of California that mostly flows underground and provides a crucial water source for the region’s arid ecosystems and communities.
-
B.
Los Angeles River
The Los Angeles River is a largely channelized urban waterway running through Los Angeles County that has played a central role in the region’s history, development, and ongoing revitalization efforts.
-
C.
Santa Cruz River
The Santa Cruz River is a significant river in southern Argentina that flows eastward from the Andes through the Patagonian steppe to the Atlantic Ocean.
-
D.
Gila River
The Gila River is a major waterway in the southwestern United States that flows through New Mexico and Arizona before joining the Colorado River.
-
E.
Arroyo Seco
Arroyo Seco is a seasonal river and canyon in Los Angeles County, California, known for its historic role in regional water management, recreation, and as the route followed by the Arroyo Seco Parkway.
- 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: Santa Ana River Target entity description: The Santa Ana River is a major waterway in Southern California that flows from the San Bernardino Mountains through inland valleys to the Pacific Ocean, shaping the region’s geography and development.
-
A.
Mojave River
The Mojave River is an intermittent river in the Mojave Desert of California that mostly flows underground and provides a crucial water source for the region’s arid ecosystems and communities.
-
B.
Los Angeles River
The Los Angeles River is a largely channelized urban waterway running through Los Angeles County that has played a central role in the region’s history, development, and ongoing revitalization efforts.
-
C.
Santa Cruz River
The Santa Cruz River is a significant river in southern Argentina that flows eastward from the Andes through the Patagonian steppe to the Atlantic Ocean.
-
D.
Gila River
The Gila River is a major waterway in the southwestern United States that flows through New Mexico and Arizona before joining the Colorado River.
-
E.
Arroyo Seco
Arroyo Seco is a seasonal river and canyon in Los Angeles County, California, known for its historic role in regional water management, recreation, and as the route followed by the Arroyo Seco Parkway.
- F. None of above. chosen
Statements (53)
| Predicate | Object |
|---|---|
| instanceOf |
river
ⓘ
watercourse ⓘ |
| basinSize |
approximately 2,650 square miles
ⓘ
approximately 6,900 square kilometers ⓘ |
| continent | North America ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| dischargeLocation | Pacific Ocean at Huntington Beach ⓘ |
| drainageBasin |
Santa Ana River
self-linksurface differs
ⓘ
surface form:
Santa Ana River watershed
|
| ecoregion | Mediterranean climate zone ⓘ |
| flowsThrough |
Anaheim
ⓘ
surface form:
Anaheim, California
Corona, California ⓘ Costa Mesa ⓘ
surface form:
Costa Mesa, California
Huntington Beach ⓘ
surface form:
Huntington Beach, California
Inland Empire ⓘ Orange County, California ⓘ Riverside County ⓘ
surface form:
Riverside County, California
Riverside, California ⓘ San Bernardino County ⓘ
surface form:
San Bernardino County, California
Santa Ana Canyon ⓘ Santa Ana ⓘ
surface form:
Santa Ana, California
|
| hasDam |
Hansen Dam (in its watershed context)
ⓘ
Prado Dam ⓘ Seven Oaks Dam ⓘ |
| hasInfrastructure |
Santa Ana River Trail
ⓘ
concrete flood control channel (lower reaches) ⓘ |
| hasTributary |
City Creek
ⓘ
Lytle Creek ⓘ Mill Creek (San Bernardino County, California) ⓘ Prado Dam spillway channels ⓘ San Jacinto River (California) ⓘ |
| historicalSignificance |
Inland Empire region of California
ⓘ
surface form:
influenced urban development in Inland Empire and Orange County
|
| length |
approximately 154 kilometers
ⓘ
approximately 96 miles ⓘ |
| locatedIn |
California, United States
ⓘ
surface form:
California
Southern California ⓘ |
| majorCityInBasin |
Anaheim
ⓘ
surface form:
Anaheim, California
Huntington Beach ⓘ
surface form:
Huntington Beach, California
Riverside, California ⓘ San Bernardino ⓘ
surface form:
San Bernardino, California
Santa Ana ⓘ
surface form:
Santa Ana, California
|
| managingAgency |
U.S. Army Corps of Engineers
ⓘ
local water districts in Southern California ⓘ |
| mouthLocation |
Huntington Beach
ⓘ
surface form:
Huntington Beach, California
Pacific Ocean ⓘ |
| region |
Greater Los Angeles Area
ⓘ
surface form:
Greater Los Angeles area
Inland Empire region of California ⓘ
surface form:
Inland Southern California
|
| sourceLocation | San Bernardino Mountains ⓘ |
| subjectTo |
flooding risk
ⓘ
seasonal flow variation ⓘ |
| usedFor |
flood control
ⓘ
irrigation ⓘ municipal water supply ⓘ recreation ⓘ |
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: Santa Ana River Description of subject: The Santa Ana River is a major waterway in Southern California that flows from the San Bernardino Mountains through inland valleys to the Pacific Ocean, shaping the region’s geography and development.
Referenced by (51)
Full triples — surface form annotated when it differs from this entity's canonical label.