Tenerife also has 'galerias' that are dug horizontally into the mountain to obtain water. (They were dug much later thsn the qanats to my understanding) https:

Tenerife also has 'galerias' that are dug horizontally into the mountain to obtain water. (They were dug much later thsn the qanats to my understanding) https://es.m.wikipedia.org/wiki/Galer%C3%ADa_filtrante https://es.m.wikipedia.org/wiki/Galer%C3%ADa_filtrante