Summarize the following poem :-

Because I have seen Bengal's face I will seek no more;

The world has not anything more beautiful to show me.

Waking up in darkness, gazing at the fig-tree, I behold Dawn's swallows roosting under huge umbrella-like leaves. I look around me

And discover a leafy dome-Jam, Kanthal, Bat, Hijol and Aswatha, trees-

All in a hush, shadowing clumps of cactus and zedoary bushes.

When long, long ago, Chand came in his honey combed boat

To a blue Hijol, Bat and Tamal shade near the Champa, he too sighted Bengal's in comparable beauty. One day, alas. 

In the Ganguri, On a raft, as the waning moon sank on the river's sandbanks,