Deuteronomy 3:5

All these are cities fenced with high walls, two-leaved doors and bar, apart from cities of villages very many;

Numbers 13:28

only, surely the people which is dwelling in the land is strong; and the cities are fenced, very great; and also children of Anak we have seen there.

Deuteronomy 1:28

whither are we going up? our brethren have melted our heart, saying, A people greater and taller than we, cities great and fenced to heaven, and also sons of Anakim -- we have seen there.

Hebrews 11:30

by faith the walls of Jericho did fall, having been surrounded for seven days;

Treasury of Scripture Knowledge

Summary

All these cities were fenced with high walls, gates, and bars; beside unwalled towns a great many.

Bible References

General references

Deuteronomy 1:28
whither are we going up? our brethren have melted our heart, saying, A people greater and taller than we, cities great and fenced to heaven, and also sons of Anakim -- we have seen there.
Numbers 13:28
only, surely the people which is dwelling in the land is strong; and the cities are fenced, very great; and also children of Anak we have seen there.
Hebrews 11:30
by faith the walls of Jericho did fall, having been surrounded for seven days;