Neribei練塀 is mud and tile (Kawara 瓦) wall topped with tiles (Kawara 瓦).
Usually, It was made from tiles(Kawara瓦), mixture of mud, chalk powder and oil.
*Houdo temple 報土寺
We can see another type of Neribei 練塀 in Iwai island in Seto Inland sea.
That is used stones instead of Kawara.
* Iwaijima 祝島