The peace negotiations were held in the cities of Münster and Osnabrück, which lie about 50 km apart from each other, in the present day German states of North Rhine-Westphalia and Lower Saxony. Sweden had favoured Osnabrück due to its Protestant background, France chose Münster due to its Catholic background. In any case two locations were required because Protestant and Catholic leaders refused to meet each other. The Catholics used Münster, while the Protestants used Osnabrück.