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In page Geography of Malaysia:

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The southernmost point of Malaysia is located in the district of Serian in Sarawak. Tanjung Piai on the southern tip of Johor is the southernmost point of the Malay Peninsula, and thus of the whole of continental Eurasia.[1][2] The easternmost point is found on the tip of Dent Peninsula in Lahad Datu district in Sabah. The northernmost point is found on the northern tip of Banggi Island. The westernmost point is Perak Island, a sandstone rock which is part of Kedah state that rises at the center of the Strait of Malacca.[citation needed]