Students' conceptions are a central learning condition. Until now there have only been qualitative results regarding the important geographical area of the desert, especially its location and formation. Therefore this study surveys students' conceptions (N = 585; n = 448 without pre-instruction on deserts and n = 137 with pre-instruction on deserts) with the help of a questionnaire containing open and closed questions. The descriptive as well as inferential statistical analysis shows that both subject-specific correct as well as subject-specific unfounded explanations regarding the location and formation of deserts are frequently found. At the same time, the conception about deserts being just sandy deserts is strongly connected with the subject-specific correctness of the conceptions regarding the location and formation of deserts. Based on the discussion of the results, information about the possibility of future research is given.