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The drainage network of the Romania's territory has a total length of 76,000 km, characterising an area of 237,500 km?. A weight of 97.8% from this network is tributary to the Danube, the second river as size after Volga River from the Europe. As geomorphologists, we approached gravel bed rivers in the context of relation-ships between channel deposits variability and some controlling factors characterising morphogenetically this region: i) longitudinal profile form related to the variation of bed material calibre; ii) grain size spectrum of bed material explained in relation with some drainage basin variables; iii) empirical evidence of the grain size modality in downstream direction; iv) petrographical variablity of bed material explained in relation with source area lithological composition. Our researches focused on the six rivers in Romania, whose drainage basins are 44,748 km?, that is, 18.8 per cent Romania's surface …