 Bintulu is located 610 kilometres ( 380 mi ) northeast of Kuching 216 kilometres ( 134 mi ) northeast of Sibu , and 200 kilometres ( 120 mi ) southwest of Miri . Bintulu is located near the mouth of the Kemena River , in the coastal region of central Sarawak . Geology of the coastal area was formed during the Pleistocene period ; silt , clay , and gravel can be found here . Geological formation from the Oligocene period is found in the inland area , which contains limestone , siltstone , and sandstone . The soil is generally soft . 
 Bintulu is located 610 kilometres ( 380 mi ) northeast of Kuching 216 kilometres ( 134 mi ) northeast of Sibu , and 200 kilometres ( 120 mi ) southwest of Miri . Bintulu is located near the mouth of the Kemena River , in the coastal region of central Sarawak . Geology of the coastal area was formed during the Pleistocene period ; silt , clay , and gravel can be found here . Geological formation from the Oligocene period is found in the inland area , which <a href='uninflect' title='1'><mark>contains</mark></a> limestone , siltstone , and sandstone . The soil <a href='drop_aux' title='2'><mark>is</mark></a>generally soft . 
Bintulu is located 610 kilometres ( 380 mi ) northeast of Kuching 216 kilometres ( 134 mi ) northeast of Sibu , and 200 kilometres ( 120 mi ) southwest of Miri . Bintulu is located near the mouth of da Kemena River , in the coastal region of central Sarawak . Geology of the coastal area was formed during tdaPleistocene period ; silt , clay , and gravel can be found here . Geological formation from thdaligocene period is found in thedaland area , which contain limestone , siltstone , and sandstone . The soil generally soft .