Qualla: Poas Volcano National Park

Poas Volcano National Park: Introduction

Sun, 22 Mar 2026 00:00:00 GMT

Photo credit MongeNajera, CC BY-SA 3.0. The smell hits before the view does. Sulfur, acrid and unmistakable, drifts up from a crater so wide you could lay a dozen city blocks inside it. Poas Volcano sits at 2,708 meters in Costa Rica's Central Valley, its main crater stretching 1.32 kilometers across and plunging 300 meters deep - dimensions that make it the largest geyser-type crater in the world. At the bottom, an acid lagoon simmers in shifting shades of turquoise and gray, its surface broken by gas emissions that have been documented since at least 1747, when Spanish governor Juan Gemir first reported the volcano's restless behavior. This is the most visited national park in Costa Rica, and the reason is simple: nowhere else can you stand at the rim of an active volcano and peer straight into its throat.

Image: MongeNajera | CC BY-SA 3.0

Poas Volcano National Park: A Crater That Breathes

Sun, 22 Mar 2026 00:00:00 GMT

Photo credit MongeNajera, CC BY-SA 3.0. Poas is a stratovolcano, built layer by layer from eruptions spanning millennia. Its summit holds not one spectacle but three: the main crater with its acid lake, the dormant Botos crater cradling a cold-water lagoon ringed by cloud forest, and the Von Frantzius cone, a remnant o...

Image: MongeNajera | CC BY-SA 3.0

Poas Volcano National Park: Two Worlds at the Summit

Sun, 22 Mar 2026 00:00:00 GMT

Photo credit Mariordo Mario Roberto Duran Ortiz, CC BY-SA 3.0. Walk the trail from the main crater to Lake Botos and you cross between geological eras. The main crater is raw geology - exposed rock, mineral stains, the sharp bite of sulfur. Botos, by contrast, sits in a dormant crater that nature has softened with centuries of growth. Cloud ...

Image: Mariordo Mario Roberto Duran Ortiz | CC BY-SA 3.0

Poas Volcano National Park: The Road Up the Mountain

Sun, 22 Mar 2026 00:00:00 GMT

Photo credit MongeNajera, CC BY-SA 3.0. Getting to Poas is half the experience. The park lies 45 kilometers northwest of San Jose, and the road that climbs to the summit winds through a landscape that changes with every hairpin turn. Coffee plantations give way to pastures, then to sections of forest broken by small st...

Image: MongeNajera | CC BY-SA 3.0

Poas Volcano National Park: Spiky Plants and a Borrowed Name

Sun, 22 Mar 2026 00:00:00 GMT

Photo credit Mariordo Mario Roberto Duran Ortiz, CC BY-SA 3.0. Nobody is entirely sure where the name Poas comes from. One theory traces it to the Latin word puas, meaning thorns or spikes, a reference to the sharp-leaved plants that colonize the volcanic slopes. Another points to a village called Puas that once sat near the mountain range. ...

Image: Mariordo Mario Roberto Duran Ortiz | CC BY-SA 3.0