Gemini Beaches, Public beach in Tsuen Wan District, Hong Kong, China.

Gemini Beaches is a small public beach at the 12-mile mark of Castle Peak Road in Sham Tseng, Tsuen Wan District, Hong Kong. It is the smallest bathing beach in the district, reached by a complicated path, and has been closed since 1995. Two large rocks beside the beach are said to resemble two fairies, which some link to its name.

Gemini Beach was gazetted by the government in 1979. In the 1980s visitors came to fish, climb the rocks and swim at what was the smallest bathing area in the district. Its E. coli readings were low enough that it nearly reached "Good" water quality, but in 1995 heavy oil pollution from large vessels and the construction of the Tsing Ma and Ting Kau bridges (1994–1996) led the government to close it; it has not reopened and no one has swum there since the 2000s.

The name 雙仙灣 refers to two large rocks beside the beach said to resemble two fairies, or to two bays overlapping at the same spot. The site is also called Castle Peak Road 12 Milestones. Since the 1980s, visitors heading to the Sham Tseng roast goose restaurants have stopped here to fish, rock-climb and swim.

The beach has been closed since 1995 and swimming is not permitted; no one has swum here since the 2000s. Access is via Castle Peak Road, known locally as 12 Milestones. Since the 2007 road widening raised the surface, the old barbecue site can be seen beneath the road.

The beach was gazetted in 1979 and closed in 1995 after oil pollution from large vessels and the construction of the Tsing Ma and Ting Kau bridges between 1994 and 1996. No one has swum there since the 2000s. When Castle Peak Road was raised during its 2007 widening, the old barbecue site was left beneath the roadway and can still be seen from the former beach.