Tuen Mun is a town near the mouth of Tuen Mun River and Castle Peak Bay in the New Territories, Hong Kong. It was one of the earliest settlements in Hong Kong which can be dated back to the Neolithic period. In the more recent past, it was home to many Tanka fishermen who gathered at the Castle Peak Bay. And now, Tuen Mun has become a modern mainly-residential area in north-west New Territories. In the Tang Dynasty, a navy town, Tuen Mun Tsang was established in Nam Tau, which lies across Deep Bay. Tuen Mun and the rest of Hong Kong was under its protection.