A Dam
distacore
A Dam
himilayan mountains
Lake Qinghai
A wall used to prevent flooding that is not a dam is a dike.
Lake Qinghai
The natural barrier that protected Egypt in the south is cataracts.
The natural barrier that protected Egypt in the south is cataracts.
The natural barrier that protected Egypt in the south is cataracts.
The Himalayan mountain range forms a natural barrier between China and Mongolia.
The Appalachian Mountains.A wall of Mountains The 1,500-mile- long Appalachian Mountain range formed a natural barrier to westward expansion.