Hiiumaa Islets Landscape Reserve
- An area comprising several islands south east of Hiiumaa, protects 187 species of birds and is rich in flora. [Estonian, English]
- http://www.laiud.hiiuloodus.ee/

Kassari Ratsamatkad
- Nature trails on horse back. [Estonian, English, Finnish, German]
- http://www.kassari.ee/

Arhipelaag
- A non-profit research and development organization whose purpose is to foster a sustainable way of life on the coast and islands. [Estonian, English]
- http://www.arhipelaag.ee/

Hiiumaa.ee
- Information about the island-county, its history, culture, economy and tourism, local communities, links to related sites. [Estonian, English]
- http://www.hiiumaa.ee/