This paper reports the results obtained for outdoor gamma dose rates in galati and Tulcea County, Eastern Romania, in the frame of a EU project referring to assessment of environmental pollution in Lower Danube Euroregion. 50 measurements were carried out in each target site in the period April-August 2014 in localities of Galati county (Galati town, Oancea, Slobozia-Oancea, Vladesti, Vadeni) and Tulcea county (Isaccea), and aquatic ecosystems of Prut river (Galati-Cahul-Gotesti area, Romania-Moldova border), Lower Danube River (Galati-Tulcea), Danube Delta (Tulcea county and Romania-Ukraine border), and lake Manta (Moldova).The natural gamma dose rate varied with site, day and hour, due to the temporal fluctuations of natural/cosmogenic radioactivity, meteorological conditions, geological substrate and presence of radiation emitted by building materials. The obtained average value of gamma radiation dose rate was 123.2 nGy/h, with a minimum value of 62.5 nGy/h (Danube Delta), and a maximum value of 207.7 nGy/h (Vladesti, Galati county, near a manure deposit). The results were compared with the official reports for external gamma dose and with the respective annual average values Romania and Moldova, our results being lower than the attention limit of 250 ngy/h. Also, it can be noted that the dose rates were in most cases in the normal range of variation given by United nations Scientific Committee on the effects of Atomic Radiation (UnSCeAR) 2008 Report from the total outdoor range gamma dose rate, which is 52 – 163 ngyh.The obtained results are an important statistical element for annual evaluation of radioactivity in Lower Danube Euroregion and for national reports and will serve as a base in further investigations and preparation of maps of terrestrial gamma dose rates.On-going work is carried out in the frame of Romanian-Moldavian-Ukrainian cross-border cooperation (Project MIS ETC 1676) between Dunarea de Jos University of Galati, Romania, Institute of Zoology and Institute of geology and Seismology, Academy of Sciences of Moldova, Chisinau, and Ukrainian Scientific Centre for Ecology of the Sea, Odessa, Ukraine, for the complex investigation of aquatic and terrestrial ecosystems in Lower Danube Euroregion.