Fortified Structure at Ha Pak Nai, Declared monument in Ha Pak Nai, Yuen Long District, Hong Kong

The Fortified Structure at Ha Pak Nai is a two-storey rectangular watchtower built of green bricks and iron rods at No. 39 Long Tsak Village. It has a mezzanine between the ground floor and roof, a projecting stair enclosure on the roof, two gun ports, and conical recessed windows that widen the view from inside.

The fort was built in 1910 by Deng Yinnan, a core member of the Revive China Society, after the failed Guangzhou New Army uprising, to shelter revolutionaries wanted by the Qing court. He ran a sugar and rice-husking factory at Langzhuo Village and added the fort as a lookout post, linked by a stone path to his青山 Farm in Tuen Mun. The factory is gone; the fort was declared a monument in June 2011.

The structure is also known as the Pak Nai Redoubt, after the village of Lo Tsam in Ha Pak Nai where it stands. It was built as a lookout for a sugar and rice mill that no longer exists, and in 2011 it was gazetted as a monument to mark the centenary of the 1911 Revolution.

The structure stands in Long Tsok Tsuen, Ha Pak Nai, in western Yuen Long, near the coast facing Deep Bay and Shenzhen. It is a two-storey rectangular building with a mezzanine between the ground floor and the roof, and a projecting stair enclosure on the roof. Look for the two gun ports on the roof and the conical recessed windows that widen the view from inside.

The two gun ports on the roof face Deep Bay and Shenzhen, built to watch the Qing-held shore across the water. The cone-shaped recessed windows widen the view from inside, and a stair structure projects from the flat roof.