Question: Valascia is an indoor sporting arena located in Ambrì, Switzerland, it is the home arena of the HC Ambri-Piotta ice hockey team, of which professional ice hockey league in Switzerland, it is the top tier of the Swiss hockey league system? 
Sentence (from "Valascia"): It is the home arena of the HC Ambri-Piotta ice hockey team of the National League (NL).
Relevant evidence: Yes