The Nam Hao (Thai: น้ำฮาว, pronounced [náːm hāːw]) or Huai Nam Hao (ห้วยน้ำฮาว) is a watercourse of Thailand.
It is a tributary of the Nan River, which it joins near Ban Aham in Nan Province.
An ancient castle moat in Nantong, China is also referred to as the Hao River.
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