Use {{location|LU}} to tag expeditions that took place in Luxembourg. It will add Category:Expeditions in Luxembourg to the expedition.
Using ISO 3166-2 abbreviations, you may also tag the Kanton that the expedition took place in.
If the category link appears red, do not worry and create the category. Make sure that it is included in the appropriate parent category, for instance, Category:Expeditions in Kanton Lëtzebuerg is a subcategory of Category:Expeditions in Luxembourg. The subcategories should be sorted in by their respective code.
Examples
{{location|LU}}: Luxembourg{{location|LU|LU}}: Kanton Lëtzebuerg
