Sentence:  The mountains run from the Arctic Island of Novaya Zemlya southwards, dividing the endless wastes of the Siberian <WSD>"taiga</WSD>" and the steppes from the Russian platform in the west. 
Meaning of the word marked with <WSD> tags:  A subarctic zone of evergreen coniferous forests situated south of the tundras and north of the steppes in the Northern Hemisphere.