Stegu Arena

Designed by Jerzy Gottfried and Władysław Feiferek, the hall opened on July 20, 1968 , known then as Hala Okrąglak — the Roundie. z o.o. changed its identity in September 2018.

Inside, the hall is defined by its synthetic floor, a parket surface capable of hosting handball, futsal, volleyball, and badminton. The capacity is listed as 3,500, though the Polish infobox records 3,378 seats, comprising 3,090 fixed positions and 288 retractable ones. The figure of 4,000 represents the maximum total for events, including temporary seating.

The venue has hosted international volleyball, including Group A matches of the 2017 FIVB Club World Championship, and qualification for the 2022 European Women's Handball Championship. The Poland vs. Lithuania match on October 6, 2021, drew 2,000 spectators. Beyond sport, the hall has seen concerts by Alphaville and Thomas Anders, a charity concert for flood victims on November 8, 2024, and the OFFOPOLE festival. It is owned by the City of Opole and operated by the Municipal Sports and Recreation Center (MOSiR).