Sundarban
Sundarban is the largest mangrove forest of the world with an area of about 10,000 km2 (3,900 sq mi), of which about 6,000 km2 (2,300 sq mi) are located in Bangladesh and about 4,000 km2 (1,500 sq mi) in India Its stand on Bay of Bengal and considered one of the natural wonders of the world. Its across the Bagerhat district of Khulna, Bangladesh.
Its a beautiful place for visit. In Sundarban you can see the monkeys are jumping one tree to another. You also can see the group of deer, who are playing all over the forest. But the best scenery is the playing together of monkey and deer.
Oh one more thing, there also have Royel Bengal Tiger :p (kidding).
One more charming scenery is the lack through the forest.
It's really impossible to describe the beauty of Sundarban. To know the actual beauty of Sundarban you must have to visit.
Best of luck and thank you :)
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Pic From: Google.com