Nanning is abbreviated as Yong, after the old Yong River.
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history
邕 has no everyday standalone use. It originally meant a walled city ringed by water, then became an old place name; today it survives almost only as the one-character abbreviation for 南宁 (Nanning) and in the river name 邕江.
register
Archaic and literary; you meet it on maps, in old texts, and in etymology notes, not in conversation.
