I hesitate to tell you how beautiful this place is, because it is not at all yet protected in any way. When you visit, please leave it as you found it and refrain from taking any more rocks away! The variety and contrast of colors in the rocks and formations (leading into) this spectacular valley are surprising. After visiting tens of times with different geologists I learn more every time - this place is unique in the world! Not only its beauty is striking because of the constrasting colors and crazy shapes, but the fact that here there are ancient rocks formed deep inside the earth that we usually never even see on the earth´s surface, plutonic and hypabyssal beauties, makes it even more fascinating. Despite the fact that you will find extremely few guides who actually really DO understand its formation and provenance, it is a fabulous quiet and awe inspiring tour. An hour and a half drive from Sn Pedro. Combines easily with a wealth of other less visited sites (Rio Grande, Yerbas Buenas, Matancilla).
Most tours will also take you for a quick stop at the Yerbas Buenas petroglyphs (ancient graffiti on ignimbrite blobs) in a huge landscape between deep canyons. Then you will drive into the Matancilla valley, soothing green and water trickling through a beautiful valley. I recommend taking your time in the ArcoIris valleys, rather than jamming in the petropglyphs, which really deserve your full attention on another separate excursion if you have the time (and a really good guide to give you teh low-down), Absolutely worth while.
Remember, please help us keep it intact !
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