Rather than an island, in fact it is the caldera of a U-shape volcano, which is still active and has geothermal activity. It is also one of the most popular tourist spots in the trips to Antarctica. As a result of geothermal activity, you can bathe in the hot water pools formed at the beach.
Some time ago, it was a large factory dedicated to the indiscriminate hunting of seals and whales; some abandoned facilities and old ships still remain and can be seen during the disembarkation.
It has black sand beaches, scarce but interesting flora, and several species of sea birds that breed on the island and the largest colony of chinstrap penguins in Baily Head.