Isla Pena (“Sorrow Island” in Spanish) is the youngest, smallest, and last of the islands in Las Cinco Muertes, from north to south. Isla Pena has very different origins from the other four islands: while the rest were formed by volcanic eruptions–which are still active on Isla Tacaño–this island has only indirect volcanic origins. The tiny, skinny island runs northeast from Isla Tacaño’s southern peninsula. Both Tacaño and Pena were formed from relatively recent lava flow that went nearly twenty miles out into the sea before stopping. In the following centuries, sand and other debris accumulated on part of the lava flow, forming Isla Pena.