The Danube river flow turns north making a great curving, bypassing rocky and extremely steep cliffs, which are over 30m high. Across Ram and closer to the left river bank there is a bigger river island formed by sand and sludge drifts and called ada Sapaja which was sunk after the construction of Djerdap dam due to increased water level. On the opposite river bank there are confluences of the Karaš and the Nera (today directed into Danube – Tisa – Danube canal). Extremely favorable natural conditions for the river crossing attracted people since prehistoric times to form their settlements and forts on this crossroads in order to control and use this important strategic position.
The biggest in history and the most important fort in wider Ram area is located in a dominant plateau “Grad”, 1km away to the east from today’s settlement, and was shielded with a stone cliff from the north, and with two stream cuts from the west and east. Today visible stone foundation remains of the up to 3m thick rampart and rectangular – shaped fort of 140 х 200m dimensions, with 11 semicircular towers and main entrance on the south side are most commonly identified as Ledereat. As an additional protection an outside rampart was built and a trench dug in the space between.
The original fort was built during I century AD in the period of Roman occupation of Podunavlje and maintaining the military border – limes – along the Danube. It was particularly significant at the beginning of II century when Trajan waged war against Dacians since it is considered that exactly on this place the majority of military troops were transferred into Dacia territory. The crossing safety was additionally enforced by building a fortification on Sapaja and on the opposite Banat river bank.
In the time of Justinian (527-565) the fort was renewed with building a smaller fortification (50 х 60 m) in the northeast corner of the old fort. Historical sources of the time place Lederata on the left river bank which made a dilemma about the exact location of the object. Since the sources date from different periods, probably the perception of the writers varied according to historical circumstances.