evidence: Standing on a rocky outcrop on the north-western tip of the Yemeni island of Socotra, the only signs of life that I could see were shoals of fish undulating beneath me in the turquoise water. To the west, the horizon shimmered pink over the ocean, a phenomenon caused by the dusty Arabian atmosphere. From the east rising towards the north, jagged granite peaks framing 80m-high sand dunes fell away into the shallows. [...] Marooned between Somalia and Yemen where the Arabian Sea and Indian Ocean meet, the Socotra archipelago is one of the most isolated continental fragments on Earth – a piece of Africa adrift at sea. The high proportion of endemic flora here have led some to label this Unesco World Heritage site the "Galapagos of the Indian Ocean". More than one-third of Socotra's 825 plant species and 90% of its reptile species don't live anywhere else in the world, and gazing up at the islands' surreal, umbrella-like dragon's blood trees and down at thousands of bright blue and red freshwater crabs that scurry in the twilight, it can feel like you're on another planet.