France - http://www.decathlon.fr/store-locator
Portugal - http://www.decathlon.pt/pt/loja
Bear in mind that some Decathlon stores are located just outside the target city, in an adjacent industrial park. This is the case at Leon. There is sometimes city bus service, or share a taxi / uber, etc. with others.
Also, the URL format for each country is similar. So you might be able to replace the country code for another and get a good result.
Smartphone mapping apps are good at sleuthing out alternative transportation methods.
Hope this helps.