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Santahamina (Swedish: Sandhamn) is an island and neighbourhood of Eastern Helsinki, Finland. At present it is a military base housing the Guard Jaeger Regiment, making access restricted. The Finnish National Defence University (NDU) is also located on the island. The C-Lion1 undersea cable comes ashore at Santahamina.
Santahamina housed before 2007 a mediumwave broadcasting station used by Yle for broadcasting on 558 kHz with 100 kW.
