The Danube Delta is a dynamic interface between the geological history – the deltaic morphogenesis and the anthropic diachronic extension. The Danube Delta complex is one of the most important geo-political and cultural entities that can be described as a compound geographical unit which provides an exceptional biodiversity. This enabled it to be counted among the UNESCO biosphere reservations, thus presenting the image of a continuously huge developing area with a scientific potential yet unilaterally approached for the time being upon prevailing geographical or biological research directions. In spite of the fact that this area has been intensely inhabited during the envisaged historical periods, a fact otherwise underlined in the case of several ancient and medieval sources, only several archaeological sites have been identified up to the present and they are affected by the permanent extension and mobility of the Danube Delta. Among them, the Greek cities of Istros – Histria Orgame – Argamum, colonies established by Miletus, which later continued their development as Roman cities, were located in the lagoonal region on the coast, while the Roman fortification Halmyris was situated on the Danube Delta’s southern branch and the small bastion was located on the island called “Bisericuta”. Another two Medieval fortresses, Heraclea, probably a Genovese fortress (present day Enisala) and the Ottoman fortification of Vadu, both situated at the western and respectively southern limit of Razim-Sinoie lagoon were identified. All these settlements were exposed, in different manners, to the influences exerted by the deltaic morphogenesis and its lagoonal system.
There are still numerous scientific debates regarding the origin and evolution of the Danube Delta. The specific studies on recent evolution at the Danube’s mouths (Antiquity and the Middle Age) can provide essential and significant contributions to the habitat’s dynamic in relation to the deltaic geomorphology. Therefore, if the existence of the Beibugeac passage is either highlighted or refuted, the location of the famous island of Peuce will be clarified. From the geomorphologic point of view, it is known that human settlements placed at the littoral level have been strongly influenced by the oscillations of the Planet Ocean. This is why the old littoral settlements of the Black Sea (10000-20000 years BP) were covered by waters, as consequence of the gradual increase in the Planet Ocean level. The waters of the Mediterranean Sea burst extremely fast through the Bosporus Strait, in the Black Sea, with an increase of several cm/day. The rapid change in the shoreline determined the massive exodus of the populations from the areas covered by water. The Milesian colony of Histria and Argamum disappeared because of the rise of the sea level and because, in front of the Halmyris Gulf, a barrier beach was built, determining the formation of the Razim-Sinoie lagoon.
But what I wish to learn is this: supposing the bed of the Euxine Sea was lower than that of the Propontis and of the sea next after the Propontis before the opening of the outlet at Byzantium, what was there to prevent the Euxine from being filled up by the rivers, whether it was previously a sea or merely a lake greater than Lake Maeotis? If this point be conceded, then I shall go on to ask this question too: Is it not true that the water-levels of the Euxine and the Propontis were such that, so long as they remained the same, there could be no straining for an outflow, for the reason that resistance and pressure were equal, but that, as soon as the inner sea reached a higher level, it set up a strain and discharged its excess water? And is not this the reason why the outer sea became confluent with the inner sea and why it assumed the same level as the inner sea — regardless of whether the latter was originally a sea or once a lake and later a sea — simply because of its mingling with the inner sea and prevailing over it? For if this point be granted as well as the first, the outflow that now takes place would go on just the same, but it would not be away from a higher sea-bed, or from a sloping one, as Strato contended.
… Strabo, Book I, 6.
This study proposes a brief review of the main evolution stages of the deltaic area, according to the most recent discoveries in the field, as well as an emphasis on the new delimitating criteria for the hinterland in the ancient and medieval time. This is the reason for which a cartographic delimitation model for the studied settlements hinterlands was created. This model takes into account the physico-geographical realities of the surrounding field, and mostly that of the Razim-Sinoie lagoon complex. This model can also be applied for other settlements, which may lead to comparisons and to drawing certain conclusions regarding the way harbour settlements were chosen. The general research perspective that we promote is that of a discipline which intertwines methods and principles pertaining to the previously mentioned subjects, which is called limnoarchaeology. It is a well-known fact that the limnology is a border discipline between geography and biology, made up of two branches. One belongs to geography (physical limnology) in the sense that it studies the depression, its means of formation, the physical-chemical characteristics and the water dynamics, and the other belongs to biology (biological limnology) in the way that it studies the flora and fauna of the still waters (biohydrocenosis). Due to this context, our approach aims to develop a new holistic viewpoint over the human habitat from the neighboring area of the deltaic and lagoonary complex of the Danube Delta, by implying methods specific to the limnological archaeology related to the whole aforementioned sciences and connected subjects. Last but not least it is worth mentioning that, as the Delta is the most dynamic area of Europe where the nature-human interrelationships can be genuinely studied, the forwarded research is meant to provide important interpretative analogies of the past.