'Walled' in the Bible

Whither shall we go up? Our brethren have made our hearts melt, saying, They are a people greater and taller than we; the cities are great and walled up to heaven; and moreover we have seen the sons of the Anakim there.

Hear, Israel! Thou art to pass over the Jordan this day, to enter in to possess nations greater and mightier than thou, cities great and walled up to heaven,