Explanation:

Manas was declared as Manas National Park in 1990 is a Wildlife Sanctuary, declared UNESCO’s Natural World Heritage site, a Project Tiger Reserve, an Elephant Reserve and a Biosphere Reserve in Assam.

• It is located in the Himalayan foothills, it is contiguous with the Royal Manas National park in Bhutan.
• The Manas river is the main river, a major tributary of Brahmaputra river.
• The Manas river basin is the largest in Bhutan, flowing north to south for 272 km in Bhutan and 104 km in Assam before joining the Brahmaputra and eventually joining the Bay of Bengal.
• The Manas River flows through the west of the park, further it splits into two separate rivers, the Beki and Bholkaduba
• Manas and five other small rivers flow through the National Park which lies on a wide low-lying alluvial terrace below the foothills of the outer Himalaya.

Hence only statement 2nd is correct.