INTRODUCTION: THE SOUTH COAST OF IRAN BORDERING ON THE oman sea IS SUBJECT TO TROPICAL CYCLONE INFLUENCE ON AN INFREQUENT BASIS; HOWEVER, THESE CYCLONES CAN GENERATE RELATIVELY LARGE sea STATES. AT MANY LOCATIONS ALONG THIS COASTLINE, PARTICULARLY IN THE CENTRAL AND EASTERN PORTIONS OF THE COAST, TROPICAL CYCLONE WAVES ARE THE DOMINANT COASTAL DESIGN WAVE CONDITION AS THE WAVE HEIGHTS CAN EXCEED THOSE GENERATED FROM OTHER METEOROLOGICAL PHENOMENA, SUCH AS THE MONSOON AND LOCAL WESTERLY WINDS. RECENTLY, IN EARLY JUNE 2007, CYCLONE GONU ENTERED THE oman sea AND LARGE WAVES WERE EXPERIENCED ALONG THE IRANIAN COASTLINE. THIS CYCLONE HAD AN UNUSUAL PATH, TRAVELLING MUCH FURTHER WEST AND NORTH THAN THE TYPICAL CYCLONE. SIGNIFICANT WAVE HEIGHTS IN EXCESS OF 4 METERS WERE MEASURED AT CHABAHAR DURING THIS EVENT.