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Rules from the NEA on scattering someone's ashes at sea in Singapore:
"Ashes may also be scattered at sea. The scattering of small amounts of ashes can be carried out at the designated site located about 1.5 nautical miles (2.8 km) south of Pulau Semakau. The scattering of ashes can be conducted daily, from 0700 hrs-1900 hours. For further information on scattering of ashes, please call the Port Marine Safety Control Centre at telephone number: 6325 2488."
Great, who wants to go so far out?!
Pulau Semakau in relation to mainland Singapore and Sentosa.