Size Duel deck / Places and long things
Seikan Tunnel
Length: tunnel length
53.9 km (33.46 mi)
Links the Japanese islands of Honshu and Hokkaido under the sea.
Sources and checks
Checked 2026-10-19: Claude (AI build agent): Wikidata statement compared, second-source quote verified in the fetched page. Quotes are short passages from each source, in their original language.
Wikidata P2043: 53850 metreQ99250, CC0, retrieved 2026-10-19
“Lengde: 53,85 kilometer”Store norske leksikon (in Norwegian): source, retrieved 2026-10-19“Lungo 53,85 km”Sapere.it encyclopedia (De Agostini) (in Italian): source, retrieved 2026-10-19
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