Abstract: 34 samples collected from the different depths of water between 0.50-68.00 m has been studied around Gökçeada (northern Aegean Sea).104 foraminiferal taxa belonging to 58 genera have been recognized in species level. These foraminifera however, show a remarkable differencealong the eastern and western coastlines of the island. Especially to the east of the island along the Aydıncık Cape there is a rich number ofPeneroplis planatus (Fichtel and Moll) and Peneroplis pertusus (Forskal). Also, to the south-east of Gökçeada the typical eastern Mediterraneanforaminifera Amphistegina lobifera Larsen and Sorites orbiculus Ehrenberg have been observed. Besides, a foraminiferal assemblage rich innumber and high in diversity has been idintified in 4 stations to the east and 3 stations to the west of the island.During another study between Gökçeada-Bozcaada-Çanakkale the genus Peneroplis, Amphistegina and Sorites have not been found. Also,along the Karaburun Peninsula, east of Çeşme (İzmir) in the İlıca Bay, there is a geothermal source with the temperature 55-58°C at a dept of2.50 m. Around this source there is an enrichment ofpeneroplids. Previous studies performed in the Gulf of İzmit, have demonstrated an extraordinart increase in the number and diversity of foraminifer a around the fault-related geothermal sources, which are not observed at the present.Thus, enrichment in the foraminifera in some stations may be explained by the geothermal effect