'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?'

As the heavenly bodies cannot be counted, and the sands of the sea cannot be measured, so I'll multiply the descendants of my servant David and the descendants of Levi who serve me.'"