miles (130 km), while an additional 100 miles (160 km) of the river can be assessed by shallow-draft craft. The remaining parts of the river, leading into the Sarawak interior, can only be assessed by small canoes. Speedboats and longboats are the major form of transport between Kapit and Belaga. Transportation above Belaga to the Balui River requires longboats. The Rajang River is also used for transporting logs. During the monsoon season, some areas of the interior are accessible only by river. Meanwhile, in the towns downriver, market traders are often affected by floods. Water quality Logging operations are rampant on the upstream of the Rajang river. A major study conducted along the Rajang river from May to December 2004 found that the main channel of the Rajang river was turbid except for smaller tributaries. The water transparency was about 4 cm to 5 cm at that time. Based on Taxonomic richness index, the stretch of upstream river between Kanowit and Belaga river is recovering from logging 15 to 20 years ago with the exception of Penaan river because the local community uses toxic chemicals to capture fish. The stretch of river downstream from Lebaan to Selalang river is considered unclean. See also List of rivers of Malaysia Notes External links References Rivers of Sarawak Rivers of Malaysia