Hi and welcome. This map is useful - it gives clubs in countries around the world, including four in Spain. https://jellicodemahjong.wordpress.com/world-riichi-map/ The Spanish mahjong federation lists some others too. https://femj.es/clubes.php I found this 2024 post about a group in the València ...

hi i live in spain and i want to play in here whit people mahjong but i dont know where, then i think to ask the local chinese people live in here i dont know if is a good idea