The Vatnsmýrin Nature Reserve (Icelandic pronunciation: [ˈvassˌmiːrɪn], "water marsh") is a protected moorland in Reykjavík, Iceland.The reserve provides a water source for Tjörnin Lake and is a nesting ground for birds.It borders the Nordic House and the University of Iceland. The area within the Reserve including drains and fences, and measures 37,026 square metres (398,540 sq ft). Eighty-three species of vascular plants are documented. Biodiversity has been inhibited due to invasive animals and plants as well as industrial waste.