In chapter 4, Gretel looks out of Bruno's window and begins questioning their surroundings. Both Gretel and Bruno are unaware that their house is located in Auschwitz, the largest Nazi concentration camp, and that the people beyond the fence are Jewish prisoners. When Gretel looks out of her window, she sees a garden located beneath Bruno's window and notices a huge wire fence that runs along the length of their home twenty feet from the garden. Gretel also takes note on the height of the surrounding fence and the barbed wire along the top. Gretel then tells Bruno that they must be in the countryside. She proceeds to explain to her brother that in her geography class they learned about the countryside, where there are huge fields that cows and other farm animals live on. However, something does not add up. Gretel and Bruno wonder where the animals are located, and they are confused about the depressed nature of the people working beyond the fence.