page_title: Inda Sillasie River
section_title: Boulders and pebbles in the river bed
hierarchical_section_title: Inda Sillasie River / Boulders and pebbles in the river bed
caption_attribution_description: English: Rubaksa rapids
context_page_description: Inda Sillasie is a river of northern Ethiopia. It originates at the confluence of May Zegzeg and May Be'ati Rivers in the mountains of Dogu’a Tembien, and flows southward to Giba River which empties finally in the Tekezé River. Along its couse, it first takes the name Rubaksa River, then Dabba Hadera River, and finally Inda Sillasie River.
context_section_description: Boulders and pebbles encountered in the river bed can originate from any location higher up in the catchment. In the uppermost stretches of the river, only rock fragments of the upper lithological units will be present in the river bed, whereas more downstream one may find a more comprehensive mix of all lithologies crossed by the river. From upstream to downstream, the following lithological units occur in the catchment.
  Phonolite plugs
  Upper basalt
  Interbedded lacustrine deposits
  Lower basalt
  Amba Aradam Formation
  Antalo Limestone
  Quaternary freshwater tufa
  Adigrat Sandstone
caption: Antalo Limestone outcrop in the Rubaksa rapids
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