Briefing of Indonesian Tectonic Plate Go to Borobudur to see geological evidence that it used to be a lake. Go for rafting close to it. Briefing of Karangsambung and Seboro melange complex. You can find many kind of rocks here. Go back to Yogyakarta.
People exploit the oil with no machine.
It has the best and most perfect Sand dune in South East Asia. Many intrusion and fault. See the meeting point of Sultan and South Sea Goddes. Caving in Cerme Cave. Visit Sultanate Palace.