In "tell me, o swan, your ancient tale," to what does the land where no doubt nor sorrow have rule refer? nature heaven the promised land an imaginary country

Kabir knows that the swan flies to many places and has seen much and chooses to say nothing about it. Kabir would like him to open up and tell what he knows.

The land is not specifically labeled. It cannot be the Promised Land. That is too specific. Nature looks beautiful, but there is a lot of nastiness in nature. I would not choose it.

If you read it poetically, it might be heaven and that is your second best answer. If it was I who constructed the question, I would choose an imaginary country, but I don't that's right.

Choose heaven, but be prepared to get it wrong. The wonderful thing about poetry is that it is interpretable. You could defend any of these answers.