Abstract: The Konyaaltı and Lara beaches are located in the center of Antalya, to the northeast and northwestparts of Gulf of Antalya, respectively. In this study, the grain size features of two beaches which controlunder the same hydrodynamic conditions were compared within detail. While the mean grain size in theKonyaaltı beach vary from -3,50 ϕ to 0,82 ϕ, in the Lara beach it ranges between -0,43 ϕ and 1,81 ϕ. Thereis increasing in the grain size depend on eastward transportation in the Konyaaltı beach, however similar changes cannot observe in the Lara beach. Sorting parameter that determined in the Konyaaltı and Larabeach represent well sorted and mostly poorly sorted, respectively. According to the results obtained fromthese two beaches, they were defined within coastal classification, and relationship between grain sizeparameters, longshore current and catchment area was discussed.