Interpretation of the ancient poem "Sending firewood to the Palace"

Wang Changling, the author of the prosperous Tang Dynasty in the era of "sending firewood to the palace", has a seven-character quatrain.

It turns out that the Yuan River flows through Wugang, so I don't feel sorry for seeing you off.

The waves in Yuanjiang are connected with Wugang, so don't be sad to leave. You and I are connected all the way, with the bright moon. Why were we in two towns?

Note: (1) Service: official name. (1) Tong Bo (Liu): Waterway connection. ⑴ Wugang: County name, in the west of Hunan Province. (1) Two townships: two places.