The topic of this thesis is the Natural Heritage of the Coastal Regions. The Republic of Croatia is a region with a rich natural heritage. Natural heritage includes national parks, nature parks, and strict reserves. Coastal Croatia is characterized mainly by national parks that contain protected flora and fauna. In research of this thesis, it was researched how natural heritage is represented in textbooks from 1st to 4th grade, research of the curriculum and the contents of the two textbooks were compared. The goal of the research is to show the representation of natural heritage in the curriculum and to determine keywords and topics about the natural heritage of coastal Croatia in the Science textbooks. The aim is also to connect the outcomes and concepts that follow according to scope and depth from 1st to 4th grades. The research included textbooks from 1st to 4th grade, and the representation was shown through teaching topics and units. The results showed that through the 1st and 2nd grades, the concept of natural heritage is ”being” reached, while in the 3rd and 4th grades, natural heritage is mentioned as an actual theme. According to research, at the end of primary education, a student should have knowledge of landforms, a geographical map, and the flora and fauna of his homeland. Also, the outcomes that the student fulfills increase by going to a higher grade. It is expected that the student has mastered the basic relief shapes and concepts to be ready to enter the 5th grade of elementary school.