Santiago Island has been volcanically active for 750,000 years (and still has the potential to erupt). In contrast, the lava field at Sullivan Bay was formed by a major eruption in 1897 and secondary events from 1904 through 1906. The lack of erosion results in a unique chance for you to explore pahoehoe lava – found only here and in Hawaii. The glazed rock forms an endless array of smooth, ropy and swirling designs highlighted with blotches of red and orange. You sense how the lava slowly oozed, bubbled and circulated in a molten soup before cooling into stunning artistic patterns. Notice the relative size of the trekking tourists in this photo. This displays the enormity and depth of the lava field you will traverse. Good hiking shoes are a must. The rocks also radiate heat, so bring a water bottle.