So the term "Sumerian school system" is problematic to say the least for reasons I don't have time at the moment to address, and it seems doubtful to me that geography as a distinct discipline was taught.. But I will briefly comment on geography and its terms. To the south and southeast were dilmun, a distant and exotic land now identified with modern Bahrain, and Magan and Meluhha, possibly the Indus Valley Culture, mainly identified as a source of exotic raw materials. To the west lay the Zagros, a land defined by barbarians and people outside the pale of civilzation, and the fantastical land of Aratta, which was more or less a stand in for the edge of the inhabited world. To the northeast lay the area of the Cedar Forest, mainly modern Syria and Lebanon, as well as the Upper Sea. This region was also home to several important kingdoms and city-states with which Sumerians traded. In the Center was Sumer itself, the core of the civilized word.