The hills are an upland region running north-south, about midway between St. Petersburg and Moscow, Russia. The hills are a northward extension of the Central Russian Upland. The ridge is overlain by deposited glacial materials in the form of terminal moraines and other detritus. The Valdai Hills reach a height, near Vyshny Volochok, of 1,125 feet (343 m).

-Encyclopædia Britannica