Grierson Reef (Filipino: Pulo ng Julian Felipe); Sin Cowe East Island (Vietnamese: Đảo Sinh Tồn Đông); Mandarin Chinese: 染青沙洲; pinyin: Rǎnqīng shāzhōu, is a cay on the eastern part of the Union Banks of the Spratly Islands in the South China Sea.

It is also claimed by China (PRC), the Philippines, Vietnam, and Taiwan (ROC).

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