The current timber pier in front of the main gate of the fortress is a replica of the loading pier located at the same place during the 18th century. Here moored ships from Loviisa and other places, carrying food, ammunition and other supplies.
Between Svartholma and the mainland there were a few small islands that also belonged to the fortress.
The closest is Hautausmaasaari island (=Graveyard island), where soldiers and prisoners who died at Svartholma were buried. There are still a few tombstones there, among others the prison director colonel Herman Tillo is buried there.
There was a great gun powder storage at Ruutikellarisaari island (=Gunpowdercellar island). The ruins of the foundation of the powder storage can still be seen in the island. Left from Ruutikellarisaari island can be seen the Arestisaari island (=Confinement island), where med who misbehaved in Svartholma would be taken for a few days of confinement. Arestisaari island is only a couple of tens of metres from the shore, but apparently it wasn’t common for people during the 18th century to know how to swim, i.e. they could not escape by swimming.