The northeastern coast of the Lake Van (Eastern Anatolia-Turkey) is exposed to energetic waves, inducing large sediment transport rates. Intense wave activity on coastal environment shows the shaping impact on the shoreline either erosional or depositional processes. Sedimentation is characterized by gravelly beaches, spit formation, and barrier-lagoon complex. Colpan barrier and lagoon complex forming the subject of this study occurred in these swashed environmental conditions. This study aims to introduce formation and evolution of the Colpan barrier and lagoon complex and to assess the future development of the coastal area around the Lake Van.