Darwin's Arch was a natural rock arch feature to the southeast of Darwin Island in the Galapagos Archipelago in the Pacific Ocean. The arch sat on an irregularly shaped, rocky, submerged plateau, nicknamed "the theatre". The arch collapsed on 17 May 2021 due to natural erosion and gravity. It left two freestanding stacks.
Darwin's Arch, along with the nearby Darwin Island, was named after English naturalist Charles Darwin, whose studies in the surrounding area helped him to form his theory of evolution by means of natural selection. As a tribute to Darwin and his works, the remaining stone "towers" are to be known as the Pillars of Evolution.