Tapae was a fortified settlement, guarding Sarmizegetusa, the main political centre of Dacia. Its location was on the Iron Gates of Transylvania, a pass between Țarcului and Poiana Ruscă Mountains and connecting the Banat to Țara Hațegului. This made it one of the very few points through which invaders could enter Transylvania from the south. Moreover, 8 kilometres down the passage into Țara Hațegului, there is Sarmizegetusa Regia.