Arenal Volcano is an active andesitic stratovolcano in north-western Costa Rica around 90 km northwest of San José, in the province of Alajuela, canton of San Carlos, and district of La Fortuna. The Arenal volcano measures at least 1,633 metres high. It is conically shaped with a crater 140 metres in diameter. Geologically, Arenal is considered a young volcano and it is estimated to be less than 7,500 years old.