Pok To Yan, Mountain summit on Lantau Island, Hong Kong.

Pok To Yan is a 529-metre summit on Lantau Island, southeast of Tung Chung, whose narrow ridge gives it the name "Thin Razor's Edge". It is built of volcanic rock like Lantau Peak, and its eastern neighbour is Por Kai Shan. The two peaks share a 76.4-hectare Site of Special Scientific Interest.

The mountain and Por Kai Shan, its neighboring peak, gained protected status in 1994 as a Site of Special Scientific Interest for environmental reasons. This designation marked the beginning of formal conservation efforts in the area.

The name Pok To Yan (薄刀屻) means "Thin Razor's Edge", taken from the narrow, blade-like ridge that gives the peak its outline. The neighbouring summit to the east is called Por Kai Shan (婆髻山). Both hills were designated together in 1994 as a Site of Special Scientific Interest covering 76.4 hectares, a status tied to the shrubland between them.

The hike starts from trails near Tung Chung Railway Station with an ascent time of roughly three hours to the peak. Good footwear and plenty of water are important since the terrain is steep and weather can change quickly in this exposed location.

The summit area supports more than 200 plant species, many of them protected indigenous varieties that thrive on the volcanic rock. This plant diversity makes it a valuable refuge for rare flora found nowhere else nearby.