 Van Goens wrote its circumference was 600 "roede" (2256 meter), while Indonesian archaeologist Widya Nayati estimated it to be 3040 meter.Rouffers' report said that the walls (which was then already destroyed) had been 5-6 meters high and 150-centimeters thick, Van Goens wrote that it was 18-20 feet-high and 12-feet thick, and Indonesian archaeologists Alifah and Hery Priswanto estimated the thickness to be between 220 and 280 centimetres.The walls were made of bricks, tuff, and andesite.