Final answer:
Mongolia is the East Asian nation with the lowest population density due to its tradition of nomadic herding on the steppe.
Step-by-step explanation:
Mongolia is the East Asian nation with the lowest population density due to its tradition of nomadic herding on the steppe that dominates the country. The vast steppe in Mongolia provides ample grazing land for livestock and makes it conducive for nomadic herding practices.
Learn more about Population density in Mongolia