Explanation:

• The Parvati Arga Ramsar Site is a permanent freshwater ecosystem situated in the Terai region of the Gangetic plains. 

• It features two oxbow lakes, Parvati and Arga, which are naturally rain-fed and formed when a river's meander is cut off, creating a distinct U-shaped water body.  

• Additionally, the nearby Tikri Forest is being developed as an eco-tourism destination, further highlighting the site's ecological and recreational significance. 

Hence option 4th is correct.