Allee, allé, aleja, alej, аллея: these are the variations of the French word ‘allée’ in German (Allee), Swedish, Norwegian and Danish (allé), Polish, Slovenian, Latvian and Slovak (aleja), Czech (alej) and Russian (аллея).

In each case, the term refers to a street, road, path or even a canal or tram line lined with trees.

See, for example, the most beautiful "Alleen" in Switzerland: https://www.baumpflege-dietrich.ch/bern-thun-interlaken/images/pdf/medien/fachberichte/die_schoensten_alleen_der_schweiz.pdf

Or take a trip to Sweden: a tree sponsorship campaign is underway for the ‘trädallé’ (tree avenue) of the Göta Canal, a 190 km canal built in the early 19th century: https://www.gotakanal.se/sv/tradfadder/

In neighbouring Norway, the Borgestad tree avenue (Borgestadallé) was crowned ‘most beautiful road of the year’ in 2012 by the Norwegian Road Administration, for the exemplary design of this avenue and its management, which has enabled it to be maintained since 1920: http://www.side3.no/dette-er-norges-vakreste-vei/3346855.html