🇲🇦 Morocco · Hydraulic works
Khettara System of the Ziz–Tafilalet Oasis (Erfoud–Rissani Line)
Early Islamic to present (1,300-yr continuity) · Sijilmassa Hezran + Filali oasis communities
Tafilalet foggara line: 45 khettaras (0.8-6 km, 120-410 shafts) feeding Sijilmassa palm oasis since 8th c.