Nikova is a stream in western Slovenia and the second left tributary of the river Idrijca. The confluence of Nikova and Idrijca is in Idrija. It originates southeast of Rejec Hill (Slovene: Rejcov grič, lit. Breeder Hill) near the hamlet of Kočevše, which is part of the Čekovnik settlement. From its source, it flows for about 1.5 km (0.9 miles) through a gorge in SE direction and then changes direction to NE for approximately 1.5 km (0.9 miles). The lower part of the flow goes for another 1.5 km (0.9 miles) through the center of Idrija in a man-made concrete channel until it meets the Idrijca River.