Translation:Mishnah/Seder Moed/Tractate Eruvin/Chapter 1/8/Translation

A caravan that is camped in a valley and is surrounded by animal related objects can carry within [that perimeter] only if the fence is 10 tefachim high and the gaps aren't larger than the walls.

Any gap that is 10 amot is permitted because it is like a door; larger than that is forbidden.