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https://en.wikipedia.org/wiki/Sopron_County
Sopron (German: Ödenburg) was an administrative county (comitatus) of the Kingdom of Hungary in present-day eastern Austria and northwestern Hungary. The capital of the county was Sopron.
Sopron county shared borders with the Austrian land Lower Austria and the Hungarian counties Moson, Győr, Veszprém and Vas. The lake Neusiedler See lies partly in the county. Its area was 3,241 km² around 1910.
Eisenstadt, Mattersburg, Rust and Oberpullendorf are now in Austria.