Terra Alta is

- a land and forest garden, nestled in a green valley among the hills of Sintra, Portugal, close to the Atlantic Ocean, a simple and complex landscape of cork oak, bamboo, fruit trees, polyculture food gardens, fireflies, sunshine and starlight.

- a school of ecological design and sustainable living skills, blending the teachings of permaculture, natural building, and those of many other traditions, from anthroposophy to indigenous knowledge.