Explanation:

The river Son is an important right-bank tributary of the river Ganga. It originates from Amarkantak highlands in the hills of the Maikala range in the Bilaspur district of Chhattisgarh at an elevation of 640 m, latitude of 20°44’ N, and longitude of 82°4’E. The river outfalls into the Ganga at about 16 km. upstream of Patna at latitude 25°14’ N and longitude 84°42’ E. The total length of the river is 881 km. The total catchment area of the river system is 70,055 sq. km. Hence, statement 1 is correct • From Amarkantak, Madhya Pradesh, the river flows in the north-northwest direction through the Shahdol district of Madhya Pradesh before turning toward the east direction where it meets the southwest-northeast Kaimur Range. The Son River flows through the states of Madhya Pradesh, Chhattisgarh, Uttar Pradesh, Jharkhand, and Bihar. Hence, statement 2 is not correct. • Gharials are found in the Son River and the river has been in the news due to a reduction in the number of Gharials for quite some time. In 1981, 161 kilometers around the Son River were declared a wildlife sanctuary to protect the endangered gharials among other animals. The number of gharials, however, has been on the decline since then: It came down to 20 in 2021 (all female) from 72 in 2016. Hence, statement 3 is correct. • Recently, the National Green Tribunal said that no sand mining will be allowed on the banks of the Son River.