Cloud forests are evergreen, moist forests that are typically located in mountain valleys, where moisture introduced by settling clouds is more effectively retained. They are characterised by a persistent, frequent, or seasonal low-level cloud cover, usually at the canopy level. Such ecosystems are quite rare globally.

The images in this set of cloud forest examplars hail from (starting clockwise from upper left) Chile, the Canary Islands, Sri Lanka, and Costa Rica.