The actual shapes and sizes of the furnaces of Sungai Batu can be deduced by comparing them with the discoveries of iron smelting sites in Jeniang, located in the upper reaches of the Sungai Muda, 45 km from the Sungai Batu site (Farahmasrine et al. 2011) (see Figure 4). Excavations in Kampung Chemara, Kampung Sungai Perahu and Kampung Kuala Gading have uncovered a few intact and well-preserved furnaces, alongside potsherds, iron remains and a tuyere (Farahmasrine et al. 2011; Norhidayahti 2015). The dome-shaped furnaces were found clustered together. Clustered forms of furnaces have also been reported in the 6th century BC sites of Krishnagiri and Guttur in Tamil Nadu (Sasisekaran and Rao 2001; Sasisekaran 2002)
