Ephel Dúath
E901117
Ephel Dúath is the dark, mountainous border range of Mordor in J.R.R. Tolkien’s Middle-earth legendarium, forming part of the land’s forbidding enclosure.
All labels observed (6)
| Label | Occurrences |
|---|---|
| Ephel Dúath canonical | 21 |
| the Ephel Dúath | 3 |
| Cirith Gorgor | 2 |
| Ephel Duath | 1 |
| Ephel Duath region | 1 |
| Ered Gorgoroth | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T11047540 — 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: Ephel Dúath Context triple: [Ered Lithui, connectedTo, Ephel Dúath]
-
A.
Barad-dûr
Barad-dûr is Sauron’s immense dark fortress in J.R.R. Tolkien’s Middle-earth, dominating the land of Mordor as his primary stronghold.
-
B.
Cirith Ungol
Cirith Ungol is a perilous mountain pass and fortress in Mordor in J.R.R. Tolkien’s Middle-earth, infamous for its association with Shelob and the final leg of Frodo and Sam’s journey into Sauron’s realm.
-
C.
Mount Doom
Mount Doom is the fiery volcanic mountain in Mordor where the One Ring was forged and ultimately destroyed in J.R.R. Tolkien’s The Lord of the Rings.
-
D.
Dol Guldur
Dol Guldur is a dark fortress in southern Mirkwood in J.R.R. Tolkien’s Middle-earth, notorious as a stronghold of evil and a key base of operations for the Necromancer during the events leading up to The Lord of the Rings.
-
E.
Dirruhorn
Dirruhorn is a mountain peak in the Pennine Alps of Switzerland, forming part of the Mischabel massif near the Mattertal valley.
- 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: Ephel Dúath Target entity description: Ephel Dúath is the dark, mountainous border range of Mordor in J.R.R. Tolkien’s Middle-earth legendarium, forming part of the land’s forbidding enclosure.
-
A.
Barad-dûr
Barad-dûr is Sauron’s immense dark fortress in J.R.R. Tolkien’s Middle-earth, dominating the land of Mordor as his primary stronghold.
-
B.
Cirith Ungol
Cirith Ungol is a perilous mountain pass and fortress in Mordor in J.R.R. Tolkien’s Middle-earth, infamous for its association with Shelob and the final leg of Frodo and Sam’s journey into Sauron’s realm.
-
C.
Mount Doom
Mount Doom is the fiery volcanic mountain in Mordor where the One Ring was forged and ultimately destroyed in J.R.R. Tolkien’s The Lord of the Rings.
-
D.
Dol Guldur
Dol Guldur is a dark fortress in southern Mirkwood in J.R.R. Tolkien’s Middle-earth, notorious as a stronghold of evil and a key base of operations for the Necromancer during the events leading up to The Lord of the Rings.
-
E.
Dirruhorn
Dirruhorn is a mountain peak in the Pennine Alps of Switzerland, forming part of the Mischabel massif near the Mattertal valley.
- F. None of above. chosen
Statements (44)
| Predicate | Object |
|---|---|
| instanceOf |
fictional mountain range
ⓘ
geographical feature in Middle-earth ⓘ |
| adjacentTo |
Ithilien
ⓘ
Morgai ⓘ Nurn ⓘ |
| alsoKnownAs |
Ephel Duath
ⓘ
linked to:
Ephel Dúath
Mountains of Shadow ⓘ |
| appearsIn |
The Lord of the Rings
ⓘ
The Return of the King ⓘ The Silmarillion (appendices and background material) ⓘ
linked to:
The Silmarillion
The Two Towers ⓘ
linked to:
The Lord of the Rings: The Two Towers
|
| associatedWith |
the realm of Sauron
ⓘ
linked to:
Mordor
|
| contains |
Minas Morgul valley
ⓘ
linked to:
Morgul Vale
Tower of Cirith Ungol ⓘ
linked to:
Cirith Ungol
|
| creator | J. R. R. Tolkien ⓘ |
| describedAs |
dark
ⓘ
forbidding ⓘ mountainous border range ⓘ |
| encloses |
the Plateau of Gorgoroth
ⓘ
linked to:
Gorgoroth
|
| fictionalUniverse | Middle-earth ⓘ |
| formsBorderOf | Mordor ⓘ |
| formsPartOf |
the mountainous enclosure of Mordor
ⓘ
linked to:
the encircling mountains of Mordor
|
| geologicalType | mountain range ⓘ |
| guardedBy | Sauron’s forces ⓘ |
| hasFunction |
enclosure of Sauron’s realm
ⓘ
natural defensive barrier of Mordor ⓘ |
| hasPass |
Cirith Gorgor
ⓘ
linked to:
Cirith Ungol
Cirith Ungol ⓘ Morgul Pass ⓘ
linked to:
Cirith Ungol
|
| languageOfName | Sindarin ⓘ |
| locatedIn | Mordor ⓘ |
| meaningOfName | Fence of Shadow ⓘ |
| notableEvent |
Frodo and Sam’s passage through Cirith Ungol into Mordor
ⓘ
Gondorian and Mordorian conflicts along the border ⓘ |
| orientation |
southern border of Mordor
ⓘ
linked to:
the encircling mountains of Mordor
western border of Mordor ⓘ |
| partOfRangeSystemWith | Ered Lithui ⓘ |
| regionOfMiddleEarth | Rhovanion and surrounding lands (border area) ⓘ |
| routeUsedBy |
Frodo Baggins
ⓘ
Gollum ⓘ Samwise Gamgee ⓘ |
| separates |
Gondor
ⓘ
Ithilien ⓘ Mordor ⓘ |
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: Ephel Dúath Description of subject: Ephel Dúath is the dark, mountainous border range of Mordor in J.R.R. Tolkien’s Middle-earth legendarium, forming part of the land’s forbidding enclosure.
Referenced by (29)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Ephel Dúath
linked to: Ephel Dúath
subject linked to:
the Black Gate of Mordor
subject linked to:
the Towers of the Teeth
linked to: Ephel Dúath
linked to: Ephel Dúath
subject linked to:
the encircling mountains of Mordor
subject linked to:
the encircling mountains of Mordor
linked to: Ephel Dúath
linked to: Ephel Dúath
linked to: Ephel Dúath