Someone would need to sail a good 60 km from the coast to see the top of Teide. https://www.ing.iac.es//~crb/trav/lp/islandvis.html https://www.ing.iac.es//~cr

Someone would need to sail a good 60 km from the coast to see the top of Teide. https://www.ing.iac.es//~crb/trav/lp/islandvis.html https://www.ing.iac.es//~crb/trav/lp/islandvis.html .. maaaaybe Fuerteventura. "The African coast lies 124 km from the highest point on Fuerteventura, Pico de La Zarza, and 97 km from the closest point on Fuerteventura, Punta La Entallada. Assuming a height of ~ 100 m for land near the Moroccan coast (there are no mountains close to the coast), the predicted visibility ranges are 137 km from Pico de La Zarza and ~ 90 km from Punta La Entallada (and ~ 100 km from a peak just inland of Punta La Entallada). Africa should therefore be visible from at least Pico de La Zarza, on a clear day. "