The thesis explores the potential of the Sava River in the city of Zagreb to perform extra-curricular teaching within the Nature and Society school subject. The introductory chapters provide theoretical views of extra-curricular teaching and its historical development. Special attention is paid to the characteristics of teaching excursions, school in nature and field teaching. The thesis also contains a geographic overview of the Sava River in general and with a special attention on the wider area of the city of Zagreb. For the purpose of the thesis, the contents of Nature and Society textbooks were firstly analyzed from the first to the fourth grade, and then the relevant professional literature and internet resources on the spatial features of the Sava River were studied. By comparing the textbook contents and spatial features of the Sava River, its potential for performing extra-curricular teaching was determined. In the Sava River area, it is possible to achieve natural, geographical, historical, economic, traffic and other contents of the Nature and Society school subject. Teaching can be done on the banks and lawns along the river, on the artificially constructed embankment, at the mouth of the river Krapina and nearby lakes (Jarun, Bundek, Lake Savica). Students can visit the water protection area and ornithological reserve Strmec and ŠRC Jarun. Part of the teaching contents can be achieved on one of the Sava bridges, boats on the river, but also in the city museum (Sava River in the historical context). The results of the research are presented both in tables and written.