The Timok region is one of mountains, rich forests, and abundant water, especially mountain springs and streams. It is these waters that in many ways define which hills and valleys belong to Timok. Settlements always arise where there is abundant water, and Knjaževac is one of these. It is located in the valley of the Beli Timok (White Timok), which together with the waters of the rivulets Svrljiški Timok and Trgoviški Timok join the Crni Timok (Black Timok) river at Zaječar, forming the Great Timok (Veliki Timok, or simply Timok). The valley of the Beli Timok is conducive to agriculture and viticulture, while the surrounding mountains are ideal for the farming of sheep and goats, as well as for walnut groves. The mountains offered protection, but also created isolation.
The term Vlah is from Old Slavonic, believed to share a common root with volkh, volkhov (magician, magus) and the pagan deity Volos, Veles (ancient slavic deity, protector of Livestock). The volkhov connection may seem strange, but it is proposed that the word was also used to designate the unknown, or strangers. This could arise from the distinctly different Vlach language which would have been unintelligible to the Slavs, or from the mystical ritual folk life of Vlasi (pl). The Vlachs were overwhelmingly pastoralists, and their lifestyle so closely tied to their flocks and herds that the etymology from Volos or Veles may have some basis there. With the adoption of Christianity, St. Blaise (Sv. Vlasije, Sv. Vlaho) took on the role of Veles, and is considered patron of domestic animals.