The banks of the Poshur river, near the Tambulbunia area, have a layer of oily mud, 18 days after an oil spill occurred about 20km away, in a UNESCO World Heritage site, when an oil-tanker named Southern Star VII, carrying 350,000 litres of furnace oil was sunk in the river after it had been hit by a cargo vessel. The event is very threatening to the region's flora and fauna.