Made of grey stone and brick, the aqueduct looks like a roadway supported by three tiers of arches traveling from the south. Looming above the canals and houses, it brings fresh water from the mainland of Essos across the mudflats and the briny shallows. Rich men pipe it directly into their homes, while commoners fill buckets at public fountains.
Because the water from the lagoon in which Braavos is located is brackish and briny, the canal water is not drinkable without first boiling it. Thus, the Braavosi built the sweetwater river to supply themselves with clean water.