Access is from the European road E 70 to exit Orsova to Drobeta Turnu Severin. It ends at the confluence of the Danube with the Bahna river.
It is a medium difficulty route, the average time is about 5 hours.
It is marked with blue triangle with white edges.
The ecotouristic route includes a hilly region without abrupt relief forms and this region is placed in the Bahna-Orşova Depression. This route’s extremities are the Orşova town (near the rail-way station) and the Danube’s confluence with Bahna.
The Bahna-Orşova basin evolution starts in the Upper Helvetian when, along an important fault system, it appears a narrow golf of the Miocene Sea (20 millions of years ago), which covered Oltenia in that times. The golf’s starting point was Baia de Aramă, it crossed onward the village of Balta and probably ended somewhere south to Bahna.
The intra-mountain Bahna-Orşova basin represents in fact a tertiary remaining of one of the channels which linked the Dacian and Pontic-Pannonian Basins during the Middle Miocene (20 millions of years), channels which crossed this part of the Meridional Carpathians which in that time were divided into fragments by many marine golfs.
The existence of that golfs and channels was relative short but sufficient to form deposits in Orşova basin, of almost 1000 m thick on a distance of approx. 18 kilometres on a breadth of only 1,5 – 4 kilometres.
The Orşova-Bahna intra-mountain depression was tectonically formed during the Lower Badenian (16 millions of years) by the badenian transgression occurred upon the Getic foundation. The badenian transgression took place by the invasion of the ParatethysSeawithordinary marine waters during the Lower Badenian.
Like any classic transgression, in the foundation can be discovered conglomeratic layers on which are depositedreef limes, white marls, successions of sands, argils, crossed stratified fluvial gravels, sands with rare sandy argillaceous intercalations and a white tuffite layer with plats remains in the foundation, on which are disposed the sarmatian gravel (12 millions of years).
The Sarmatian fauna is a low salinitywater fauna due to link closing of the Central Parathetis with the Planetary Ocean. Starting from Sarmatian, the Sarmatian Sea waters are low salinitywaters, the same in the Dacian Basin which represents a part of the Central Parathetis.
To the end of the Badenian, the basin northern part is isolated and it is possible in that era to begin the break of the link with the Dacian Basin, definitive interruption once with the Sarmatian beginning. Some fauna characters (especially the reduced sizes of the forms) are the consequences of some environment conditions particular to small surface basin.
The rout is very important from the historic point of view because almost a half from its length, which waves in the Ţarovăţ Valley, superposes on the former Austrian – Hungarian border. Besides, the route follows the path used in the XIX- th century by the old border guard soldiers to patrol, path called “Patraulă”.
The ecotouristic routes presents a very low difficulty level excepting a small part in the Ţarovăţ Valley where waterfalls have been formed in this river bed and the access sometimes coincides with the proper channel of the Ţarovăţ River.