The climate south of the Huai is warmer and wetter than north of it.
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history
The Han kingdom of 淮南 was ruled by 刘安 (179–122 BC), whose court compiled the philosophical anthology 《淮南子》; tradition also credits him with inventing 豆腐. The modern city is formally 淮南市.
culture
The saying 橘生淮南则为橘 'an orange grown south of the Huai is an orange' goes on to say that north of the river it turns into a bitter orange: people are shaped by their surroundings.
