is a major reason for the poor connectivity of the area; bridges are often washed away. Major flooding occurs almost annually, causing a significant loss of life and property. Rivers The Koshi River and its tributaries flood annually, affecting about 21,000 km2 (8,100 sq mi) of fertile agricultural lands and affecting the rural economy. This is the most devastating river of Bihar, earning it the epithet "Sorrow of Bihar". The Bagmati River regularly breaches its embankments and frequently changes its meandering courses. The annual rate of deposition of alluvium is very high.. The Gandak River also flows through the southern part of Saharsa. Demographics In 2011, Saharsa had population of 1,897,102, of which male and female were 995,502 and 901,600 respectively. There was change of 25.79 percent in the population compared to population as per 2001. In the previous census of India 2001, Saharsa District recorded increase of 33.03 percent to its population compared to 1991. The initial provisional data suggest a density of 1,125 in 2011 compared to 895 of 2001. Total area under Saharsa district is of about . Average literacy rate of Saharsa in 2011 were 54.57 compared to 39.08 of 2001. Male and female literacy were 65.22 and 42.73 respectively. For 2001 census, the same figures stood at 51.66 and 25.27 in Saharsa District. Total literate in Saharsa District were 829,206 of which male and female were 521,560 and 307,646 respectively. In 2001, Saharsa District had 465,577 in its total region. The sex ratio in Saharsa stood at 906 female per 1000 male compared to 2001 census figure of 910. The average national sex ratio in India is 940 as per latest reports of Census 2011 Directorate. Communication links is a railway station under the East Central Railway. Saharsa Junction covers up to , Forbesganj Station and . It is an A category railway station under Samastipur railway division. This railway junction has been certified as ISO:14001:2015 for environmental management. Saharsa Junction is one of the top 50 rail ticket booking station in India and top 3 rail ticket booking station in ECR. In early 2005, a much-awaited broad gauge line connected it to Khagaria on the New Delhi-Guwahati main line. Earlier there was only a metre gauge line on the Khagaria – Mansi – Forbesganj section of the East Central Railway. Saharsa is directly connected to , , , , and via Train. Saharsa is