How to Say "arena" in Spanish
The most common Spanish word for “arena” is “estadio” — use 'estadio' for a large, often open-air venue primarily used for sports events, concerts, or other large public gatherings. It implies a significant capacity and infrastructure..
estadio
es-TAH-dee-oh/esˈtaðjo/

Examples
El estadio estaba lleno para la final de la Copa.
The stadium was full for the Cup final.
Necesitamos un mapa para encontrar nuestra puerta en el estadio.
We need a map to find our gate in the stadium.
El concierto más grande se realizó en el estadio olímpico.
The biggest concert was held at the Olympic stadium.
Masculine Noun
Even though it ends in '-o' like many Spanish words, 'estadio' is always masculine, so you always use 'el' (el estadio) or 'un' (un estadio).
arena
ah-REH-nah/aˈɾena/

Examples
Miles de personas llenaron la arena para ver el concierto.
Thousands of people filled the arena to see the concert.
Los gladiadores luchaban en la arena en la antigua Roma.
The gladiators fought in the arena in ancient Rome.
El debate político se convirtió en una verdadera arena de combate.
The political debate turned into a real fighting arena (a hostile environment).
Figurative Use
When used figuratively, 'arena' refers to a place or field of intense competition, conflict, or public display, like 'la arena política' (the political arena).
Estadio vs. Arena
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