Hiiu County (Hiiu maakond), or Hiiumaa, is one of 15 counties of Estonia. It consists of Hiiumaa (Dagö), the second largest island of Estonia, and several smaller islands near it. The county borders Lääne County to the east and Saare County to the south. 0.7% of the total population of Estonia live in Hiiu County.
On demands of the Hanseatic League a lighthouse was built in Kõpu in the beginning of XVI century (previously known as Dagerort). It is considered the third oldest continuously operating lighthouse in the whole world, still showing its light to 35 miles to the sea.
The best part of the farm architecture comes from the XIX century. Examples are Mihkli farming complex and Soera farm-museum with all the old national artefacts.
The county is subdivided into municipalities. There are 1 urban municipality (Estonian: linn - city) and 4 rural municipalities (Estonian: vallad - parishes) in the county.
In the landscapes there can be found pine forests, mixed spruce and deciduous forests, swampy thickets and juniper shrubs, coastal meadows and bogs. The most frequent tree is pine which makes about a half of forests. Pine is followed by birch, spruce and alder. In total, there are about 1,000 species of vascular plants, of which about 100 are under protection. The wildlife of Hiiumaa is remarkable. Out of 30 species of mammals, big game as elk, deer, fox, wild boar and lynx roam the island. There are about 250 species of birds on the island, 195 of them nesting.
Among the Estonian counties Hiiumaa is the richest in forest - nearly 60 % of the island are wooded areas. There are large marsh areas in the middle of the island. The marshes cover about 7 % of its area. Cultivated land and settlements take about 23 % of the area of the county.