'Sands' in the Bible

They did not ask: 'Where is the Lord who delivered us out of Egypt, who brought us through the wilderness, through a land of desert sands and rift valleys, through a land of drought and deep darkness, through a land in which no one travels, and where no one lives?'

I will make the children who follow one another in the line of my servant David very numerous. I will also make the Levites who minister before me very numerous. I will make them all as numerous as the stars in the sky and as the sands which are on the seashore.'"