What country does Taiga cover most of ?
The southern limit is more variable , depending on rainfall ; taiga may be replaced by forest steppe south of the 15 °C ( 59 °F ) July isotherm where rainfall is very low , but more typically extends south to the 18 °C ( 64 °F ) July isotherm , and locally where rainfall is higher ( notably in eastern Siberia and adjacent Outer Manchuria ) south to the 20 °C ( 68 °F ) July isotherm .