Wikimedia neighborhood · Wikidata observation Observed Graph-projection

Seikan Tunnel

undersea railway tunnel in Japan connecting Hokkaido and Honshu

Provider: Wikidata. These recorded connections are observations, not Counterpedia claims. They do not establish source support.

Data and provenance

Provider: Wikidata · Entity ID: Q99250

Release: sha256:f33228901a35b0683356002a46df9ceb11f399d05f17abb5c7c78256cbf38ba7

Graph membership is not truth. Each relation below is an observed typed edge the local Wikimedia graph bundle already materialized — not a corroborated, verified, or admitted claim. Bounded to 40 relations via an offset-index lookup (offset_index_binary_search), never a full scan of the bundle.Serving a published subset: joined entities + 1-hop neighborhood of 35,994 exact Wikipedia–Wikidata title matches. A subject that is not itself in that subset carries only the relations the subset recorded for it, so a small count here is the published scope and not a complete relationship inventory.

Development requests are not available on this deployment. The observed entity and its graph links remain readable.

1-hop relations (40+)

Observed adjacency only. Each spoke is a typed edge already materialized in the graph, labeled by its recorded predicate — graph proximity is not support, corroboration, or admission. The links below are the accessible, no-JavaScript path to the same neighbors.

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Grouped by a fixed presentation taxonomy for legibility only. The grouping asserts no rank, truth, support, or standing — every observed edge is carried, none reordered by importance.

Identity & relations (1)

→ instance of (P31)undersea tunnelObserved
Relationship details
Provider: Wikidata · Property: P31 · Direction: outgoing · Entity ID: Q1317590

Dates & events (1)

→ inception (P571)10 March 1985Observed
Relationship details
Provider: Wikidata · Property: P571 · Direction: outgoing

Places (4)

→ country (P17)JapanObserved
Relationship details
Provider: Wikidata · Property: P17 · Direction: outgoing · Entity ID: Q17
→ coordinate location (P625)41.3157° N, 140.3351° EObserved
Relationship details
Provider: Wikidata · Property: P625 · Direction: outgoing
→ located in the administrative territorial entity (P131)ShiriuchiObserved
Relationship details
Provider: Wikidata · Property: P131 · Direction: outgoing · Entity ID: Q1354297
→ located in the administrative territorial entity (P131)ImabetsuObserved
Relationship details
Provider: Wikidata · Property: P131 · Direction: outgoing · Entity ID: Q1362366

Other connections (31)

→ has part(s) (P527)Tappi-Kaitei StationObserved
Relationship details
Provider: Wikidata · Property: P527 · Direction: outgoing · Entity ID: Q23498231
→ Relationship name unavailable (P2868)Japan's longest railway tunnelObserved
Relationship details
Provider: Wikidata · Property: P2868 · Direction: outgoing · Entity ID: Q117463409
→ Relationship name unavailable (P856)https://www.jrhokkaido.co.jp/network/seikan/Observed
Relationship details
Provider: Wikidata · Property: P856 · Direction: outgoing
→ Relationship name unavailable (P2505)Hokkaido ShinkansenObserved
Relationship details
Provider: Wikidata · Property: P2505 · Direction: outgoing · Entity ID: Q1364115
→ Relationship name unavailable (P930)25 kV, 50 Hz AC railway electrificationObserved
Relationship details
Provider: Wikidata · Property: P930 · Direction: outgoing · Entity ID: Q106530439
→ Relationship name unavailable (P5252)青函トンネル入口広場トンネル神社 P1261002.JPGObserved
Relationship details
Provider: Wikidata · Property: P5252 · Direction: outgoing
→ Relationship name unavailable (P2505)Kaikyō LineObserved
Relationship details
Provider: Wikidata · Property: P2505 · Direction: outgoing · Entity ID: Q907716
→ Relationship name unavailable (P5775)Inside seikan tunnel.JPGObserved
Relationship details
Provider: Wikidata · Property: P5775 · Direction: outgoing
→ Relationship name unavailable (P1801)Seikan tunnel nameplate.JPGObserved
Relationship details
Provider: Wikidata · Property: P1801 · Direction: outgoing
→ Relationship name unavailable (P2713)Seikan Tunnel profile diagram.svgObserved
Relationship details
Provider: Wikidata · Property: P2713 · Direction: outgoing
→ has part(s) (P527)Yoshioka-Kaitei StationObserved
Relationship details
Provider: Wikidata · Property: P527 · Direction: outgoing · Entity ID: Q848922
→ Relationship name unavailable (P5008)Wikipedia:Vital articles/Level/4Observed
Relationship details
Provider: Wikidata · Property: P5008 · Direction: outgoing · Entity ID: Q6173448
→ Relationship name unavailable (P177)Tsugaru StraitObserved
Relationship details
Provider: Wikidata · Property: P177 · Direction: outgoing · Entity ID: Q271521
→ Relationship name unavailable (P137)Japan Freight Railway CompanyObserved
Relationship details
Provider: Wikidata · Property: P137 · Direction: outgoing · Entity ID: Q1190669
→ Relationship name unavailable (P1365)Seikan FerryObserved
Relationship details
Provider: Wikidata · Property: P1365 · Direction: outgoing · Entity ID: Q11661111
→ Relationship name unavailable (P127)Japan Railway Construction, Transport and Technology AgencyObserved
Relationship details
Provider: Wikidata · Property: P127 · Direction: outgoing · Entity ID: Q6157804
→ Relationship name unavailable (P1619)13 March 1988Observed
Relationship details
Provider: Wikidata · Property: P1619 · Direction: outgoing
→ Relationship name unavailable (P2713)Seikan Tunnel 3d cross section 1a.svgObserved
Relationship details
Provider: Wikidata · Property: P2713 · Direction: outgoing
→ Relationship name unavailable (P1705)青函トンネル (ja)Observed
Relationship details
Provider: Wikidata · Property: P1705 · Direction: outgoing
→ Relationship name unavailable (P559)HonshuObserved
Relationship details
Provider: Wikidata · Property: P559 · Direction: outgoing · Entity ID: Q13989
→ Relationship name unavailable (P137)Hokkaido Railway CompanyObserved
Relationship details
Provider: Wikidata · Property: P137 · Direction: outgoing · Entity ID: Q498930
→ Relationship name unavailable (P1064)1067 mm track gaugeObserved
Relationship details
Provider: Wikidata · Property: P1064 · Direction: outgoing · Entity ID: Q1193463
→ Relationship name unavailable (P793)start of constructionObserved
Relationship details
Provider: Wikidata · Property: P793 · Direction: outgoing · Entity ID: Q27136782
→ Relationship name unavailable (P8786)Fukushima Town Seikan Tunnel MuseumObserved
Relationship details
Provider: Wikidata · Property: P8786 · Direction: outgoing · Entity ID: Q11593178
→ Relationship name unavailable (P1064)standard-gauge railwayObserved
Relationship details
Provider: Wikidata · Property: P1064 · Direction: outgoing · Entity ID: Q1999572
→ Relationship name unavailable (P15)Seikantunnel - Tsugaru street detail.PNGObserved
Relationship details
Provider: Wikidata · Property: P15 · Direction: outgoing
← main subject (P921)seikan-tunnel-museumObserved
Relationship details
Provider: Wikidata · Property: P921 · Direction: incoming · Entity ID: Q11661106
← Relationship name unavailable (P301)Category:Seikan TunnelObserved
Relationship details
Provider: Wikidata · Property: P301 · Direction: incoming · Entity ID: Q18742314
← main subject (P921)Fukushima Town Seikan Tunnel MuseumObserved
Relationship details
Provider: Wikidata · Property: P921 · Direction: incoming · Entity ID: Q11593178
← Relationship name unavailable (P1366)Seikan FerryObserved
Relationship details
Provider: Wikidata · Property: P1366 · Direction: incoming · Entity ID: Q11661111
← Relationship name unavailable (P276)Tappi-Kaitei StationObserved
Relationship details
Provider: Wikidata · Property: P276 · Direction: incoming · Entity ID: Q23498231

External identifiers (3)

→ Commons category (P373)Seikan TunnelObserved
Relationship details
Provider: Wikidata · Property: P373 · Direction: outgoing
→ image (P18)Seikan Tunnel entrance - dual-gauge track.jpgObserved
Relationship details
Provider: Wikidata · Property: P18 · Direction: outgoing
→ topic’s main category (P910)Category:Seikan TunnelObserved
Relationship details
Provider: Wikidata · Property: P910 · Direction: outgoing · Entity ID: Q18742314

More relations exist beyond this bounded panel's cap of 40. This panel intentionally shows a small neighborhood, not the full graph.

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