(idiom) Specifically referring to northern Jiangxi province or generally the middle and lower reaches of the Yangtze River; it is named for being at the upper reaches of the ancient state of 吴wú and the lower reaches of the ancient state of 楚chǔ
intertwined
(idiom) Head in 吴wú and tail in 楚chǔ; describes two regions or things that are close together and overlap, where one starts where the other ends