By seating capacity, what is considered the largest NHL hockey arena?

Centre Bell (also referred to as the Bell Centre) is a sports and entertainment complex in Montreal, Quebec, Canada. It opened on March 16, 1996. It is the home of the National Hockey League's Montreal Canadians ice hockey team. It has a seating capacity of 21,288 making it the largest hockey arena in the NHL.

Unlike most North American arenas, Centre Bell was designed by a local consortium. So, it has many unique design features. The grandstands are steeply sloped to improve sight lines. Washrooms are on the 100 level; they are centralized and located at each end.

Centre Bell is specifically arranged in a three-tier layout. The lower 100 section is commonly referred to as "the reds" since the seats are painted red. The 200 section is known as "Club Desjardins". It is the premium section between two levels of private and corporate boxes. Here, larger seats and free food and non-alcoholic drinks are provided. The upper level with a large number of seats is the 300-400 section.