Helsinki Halli (formerly Hartwall Arena) is a large multi-functional indoor arena located in Helsinki, Finland. It was opened in April 1997. The arena is convertible for various events. The total seated capacity during ice hockey games is 13,349 (about 14,000 for basketball, for concerts up to 15,000) and as an amphitheatre, it is significantly reduced to between 3,000 to 5,000. The formerly Russian-owned arena has been unused since March 2022 due to EU sanctions related to the Russian invasion of Ukraine.
https://en.wikipedia.org/wiki/Helsinki_Halli