越中 is a literary name for the core territory of the ancient
越国 (Yue Kingdom), centered on today's
绍兴 in Zhejiang. It appears in Tang poetry most famously in
李白's
《越中览古》:
越王勾践破吴归,义士还家尽锦衣 - the poem meditates on King Goujian's victory over Wu, and the eventual decay of his palace.