Kristianstad Vattenrike Biosphere Reserve, a protected swamp area in the Hammarsjön Lake, surrounding the town of Kristianstad in Scania, southern Sweden. Sweden's lowest point is located in the reserve at 2.41 metres below sea level. The point is at the bottom of what was once Nosabyviken, a bay on the lake of Hammarsjön. The bay was drained in the 1860s by John Nun Milner, an engineer, to get more arable land for Kristianstad.