It was not until the banks widened at low tide that the wind just set sail: the tide rose, and the banks were flush with the river, and they were very open. Sail before the wind just hung the sail high.

The bank widens until the ebb tide. Source: A berth at the foot of Beibao Mountain in Wang Wan.

Full text:

Under the blue mountain, my boat and I meandered along the green water. Until the river bank widens at low tide, and no wind blows my lonely sail.

... night gives way to the ocean of the sun, and the old year melts in freshness. I can finally send my messenger, the wild goose, back to Luoyang.

Meaning:

Travelers pass through the desolate Gubei Mountain, and ships follow the blue river. At high tide, the banks of the river are flush with the river and very open. Sail before the wind just hung the sail high.

The night is not over, a red sun has risen from the sea, spring is early on the river, and the old year has not passed the New Year. How to convey a letter sent to my hometown? Goose returning to the north, please help me take it home and bring it back to Luoyang.