Antalya-Mersin (D400) route is the most important road providing west-east connection in the eastern Mediterranean region. Recently, a new route selection became a current issue because of the difficulties experienced in providing transportation along this single-lane road. However, during the construction phase, a variety of engineering problems are faced along the route due to presence of the mountain ranges with rugged topographies. In year 2011, between kilometers 221+300–221+700 of the Alanya-Anamur-Mersin road, a mass movement occurred with an approximate length of 80 m, with of 300 m and depths ranging between 6-29 m. This movement developed in the Precambrian aged Tenzile formation. This unit displays a rather heavily fractured-jointed structure with alteration zone reaching to a depth of 5 m. Mechanisms triggered this mass movement determined as geological, geotechnical and topographic properties of the units, along with intense rainfalls that have occurred in the region. According to findings obtained from inclinometer measurements made in 8 boreholes drilled by 5th Regional Directorate of Highways and field observations; this mass movement possibly started as rotational and then continued on the plane of weakness as planer failure.