What is the distance between Transylvania and Birkenau?

The distance between Transylvania, a historical region in Romania, and Birkenau, the site of the Auschwitz II concentration camp in Poland, is approximately 650 kilometers (about 400 miles) by road. The exact distance can vary depending on the specific locations within Transylvania and the chosen route. If traveling by air, the direct distance is slightly less, around 550 kilometers (about 340 miles).