The castle mound of Incēni is situated not far from Kokmuiža on the right bank of River Avīkne. The castle mound is man-made and has an almost quadrangular form with unusually steep sides in the south-western part at a height of about 7m. Remains of the ancient town have been found in the eastern part, proved by a thick archaeological layer with findings of chippings and antiquities. In written sources the castle mound was first mentioned in the Bisection agreement of Zemgale in 1272. The odds are that the castle mound of Incēni (Dobe) was the ancient centre of the castle region and the main fortification of Dobe.
Earnest Brastin analysed the castle mound in 1923. He was sure that the castle of Sidrabene had been situated there.
