It refers to the period when the most important settlements between Niksar and Amasya, namely Erek, Karayaka, Sonusa (Uluköy), and Taşâbat (Taşova) were collectively named as Nevah-i Erbaa or "four towns" as they were in the same region and close to one another. Even the accrued taxes of the time were recorded in this name. In 1840, the taxes collected from these four towns were registered to be 47,243 kuruş.
The period when the most significant settlements between Niksar and Amasya, namely Erek, Karayaka, Sonusa (Uluköy), and Taşâbat (Taşova), were collectively referred to as Nevah-i Erbaa or "four towns" due to their proximity.