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How large was the Polish-Lithuanian Commonwealth at its greatest extent?

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Map showing Poland's territory in 1634 under the reign of Wladyslaw IV Vasa, shaded in pink and spanning from the Baltic Sea in the north to near Kyiv in the southeast. Major present-day cities such as Warsaw, Krakow, Gdansk, Vilnius, Minsk, Lwow (Lviv), Pinsk, and Kyiv are marked within the territory, with surrounding cities like Moscow, Riga, Vienna, and Budapest shown for reference. — Polish-Lithuanian Commonwealth Poland's territory in 1634, during the reign of Władysław IV Vasa.

At its greatest extent in the early 17th century, the Polish-Lithuanian Commonwealth comprised nearly 400,000 square miles (approximately 1,000,000 square kilometers) and had a population of some 11 million inhabitants.1