Sai Kung West Country Park, Nature reserve in Sai Kung Peninsula, Hong Kong.

Sai Kung West Country Park is a 30-square-kilometre country park on the Sai Kung Peninsula in northeast Hong Kong, designated on 3 February 1978. Its area runs from Pak Tam Chung to Yung Shue O and includes Wong Chuk Wan, Tai Mong Tsai, Lai Chi Chong and Hoi Ha Marine Park. A wooden signpost at the edge of the trail reads "Tsai Nature Education" and "Kung Wan Tsai Nature Trail", beside a small roofed shelter among dense green foliage.

The reserve was established in 1978 when Hong Kong moved to protect its natural resources. Former fishing communities in the area became part of the protected land.

The Pak Sha O village displays traditional Hakka architecture with decorated doorways and relief murals from earlier times. Visitors can observe these building styles and understand how residents once lived in this place.

The park covers 30 square kilometres from Pak Tam Chung to Yung Shue O. The 20 campsites at Wan Tsai West Camp, near Hoi Ha Marine Park, each have a barbecue pit and table, and the large toilet block has shower facilities. The camp suits inexperienced campers and has hosted international camping events.

The park contains the Four Pools formation where mountain streams create natural plunge pools along the coast near Ham Tin Wan. These pools offer a rare combination of mountain and seaside experiences in one place.