Zasechnaya cherta (, loosely translated as Great Abatis Line or Great Abatis Border) was a chain of fortification lines, created by Grand Duchy of Moscow and later the Tsardom of Russia to protect it from the Crimean-Nogai Raids who, rapidly moving along the Muravsky Trail, ravaged the southern provinces of the country during a series of the Russo-Crimean Wars. It was south of the original line along the Oka River. It also served as a border between the Muscovite State and the steppe nomads. As a fortification line stretching for hundreds kilometers, the Great Abatis Border is analogous to the Great Wall of China and the Roman limes.