en:Seuil de Naurouze has an interwiki link to fr:Écluse de la Méditerranée. However, while translating this into Japanese Wikipedia, it was converted to an external link instead of the original interwiki link.
Topic on Talk:Content translation
(addition) [1] above is <nowiki>[https://fr.wikipedia.org/wiki/Écluse de la Méditerranée]</nowiki>. Sorry.