This article is about the volcano. For the parish of the same name see Água de Pau.Água de Pau is a stratovolcano in central part of São Miguel Island. About 30000 to 45000 years ago the 4 km wide and 7 km long outer caldera was formed. The inner caldera which is 2.5 km wide and 4 km long was formed about 15000 years ago. The younger inner caldera is partially filled by the crater lake Lagoa do Fogo.
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