Spanish to English Art/Literary Photography/Imaging (& Graphic Arts)

I am stuck on the word "cierre". The English match that I found was "closure", but I am not sure about it. The picture I have does not really help me either (it shows a simple rock wall). The complete sentence is the following: "Con piedras, rocas, pizarras y paciencia...por el suelo se levantan cierres y muros para marcar las fincas." So, any ideas? Is "closure" right or there a better word for it? Thanks in advance!