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The Hule and Río Cuarto maars are respectively located 11 and 18km northward of the active crater of Poás volcano, on the Caribbean side of the Central Volcanic Range of Costa Rica. They lie on the northern part of Poás volcano massif, along a N–S trending, ~27km-long volcanic fracture crossing the Poás volcano. The volcanic products from Hule maar (2.3km×1.8km, area ~3.5km 2 ) are mainly...