This paper addresses the lack of international knowledge and research in interdisciplinary curriculum development and teaching in the subjects of Physical Education and Geography. The authors analysed and compared elementary school curricular documents from two ex-communist countries, the Czech Republic and the Republic of Slovenia (an ex-socialist Yugoslav republic) to reveal how integration of Physical Education and Geography can be embedded at the policy level. A questionnaire survey among teachers examined how the integration is implemented in practice. The authors present some practical examples to show how Physical Education and Geography integration can be achieved. The findings of the study indicate that while interdisciplinarity is an important policy goal of the educational systems of these two countries, integration is not being implemented in practice.