It covers West Coast of Jawa, North Coast of Jawa Eastwards to Tanjung Bendoh, South and East Coasts of Sumatera, Selat Sunda, Selat Bangka, Selat Gelasa,Selat Karimata, South and West Coasts of Kalimantan from Tanjung Puting to Pulau Pontianak, Pulau-pulau Badas and Tambelan, Pulau-pulau Lingga and Riau, with the various routes leading to Singapore and South China Sea.