Global Volcanism Program | Image GVP-09132
Botos cone forms the 2708 m high point of the Poás volcanic massif. It was the eruptive focus prior to about 7500 years ago, when that focus shifted to the presently active crater (which lies beneath the clouds to the NW). The 1-km-wide Botos maar is filled by a 400-m-wide coldwater lagoon sometimes known as Laguna del Fría or Laguna del Poás. The lake has a maximum depth of 14 m. The cold, freshwater lagoon contrasts with the hot, extremely acidic lake of the main crater.
Photo by S. Mora, 1988 (courtesy of Guillermo Alvarado, Instituto Costarricense de Electricidad).