Kursi* is a post-caldera cone located in the Tengger Caldera, East-Java, Indonesia. The cone is likely extinct, and is located South of the active cone of Bromo.
*The crater/summit ridge is sometimes also referred to as Kembang, Watangen, Kursi-Watangan. I`ve not been able to establish what is the official name for the crater, however `Kursi` seem to be the most used.
Read more about the Tengger Caldera at the Global Volcanism Program