The 12,016-hectare Parque Nacional Volcán Arenal lies within the 204,000-hectare Arenal Conservation Area, protecting eight of Costa Rica's 12 life zones and 16 protected reserves in the region between the Guanacaste and Tilarán mountain ranges, and including the Arenal Lake.

The flora is varied, with species such as the mountain guayabo, freijo, rosewood, chicle tree, balsa and others. The main species of fauna are the paca, baird's tapir, white-nosed coati, sloth, deer; birds such as parrots, parakeets and the resplendent quetzals.

The Arenal Volcano is the only volcano in Costa Rica that has been constantly active for the past 400 years. It witnessed a huge 1968 eruption, producing huge amounts of ash columns, explosions and the glowing red lava.

The Arenal volcano is the most happening sight for all those who visit the Arenal National Park. In order to enjoy the sparkling and dazzling sight, the tourists prefer to visit the park at night to watch the red hot lava flowing and embers, putting forward a spectacular art work.