🇳🇬 Nigeria · Earthwork
Ancient Kano City Walls
Hausa Kingdom of Kano to Sokoto (1095–1807 CE; peak 14th–18th c.) · Hausa (Kano)
Ancient Kano City Walls (Badala) are West Africa's most impressive earthwork: 14 km main wall, 10 m high with 40 m base and moat, plus outer and inner walls totalling 40 km, founded 1095 CE by…