The County of Zutphen, located in modern-day Gelderland, a province of the Netherlands, was formed in the eleventh century as a fief of the Bishop of Utrecht. It was ruled by the Counts of Zutphen between 1018 and 1182, and then formed a personal union with Guelders. Later, it became one of the 4 quarters of Guelders. The name Graafschap (county) is still used for the Achterhoek, the region east of Zutphen, and for the football club De Graafschap from this region.
Zutphen (Dutch pronunciation: [ˈzʏtfə(n)]) is a town in the province of Gelderland in the Netherlands. It lies some 30 km north-east of Arnhem, on the Eastern bank of the river IJssel at the point where it is joined by the Berkel. The name Zutphen (first mentioned in the eleventh century) appears to mean 'zuid-veen', or in English, south-fen.
In 2005, the municipality of Zutphen was merged with the municipality of Warnsveld, retaining its name. The municipality had a population of 47,052 in 2014.
About 300 AD a Germanic settlement was the first permanent town on a complex of low river dunes. Whereas many such settlements were abandoned in the early Middle Ages, Zutphen on its strategic confluence of IJssel and Berkel stayed. After the incorporation of the IJssel lands in Charlemagne's Francia, Zutphen became a local centre of governance under a count. The Normans raided and ravaged it in 882. Afterwards a circular fortress was built to protect the budding town against Viking attacks.
This is a list of craters on Mars. There are hundreds of thousands of impact crater on Mars, but only some of them have names. This list here contains only named Martian craters starting with the letter O – Z (see also lists for A – G and H – N).
Large Martian craters (greater than 60 km in diameter) are named after famous scientists and science fiction authors; smaller ones (less than 60 km in diameter) get their names from towns on Earth. Craters cannot be named for living people, and small crater names are not intended to be commemorative - that is, a small crater isn't actually named after a specific town on Earth, but rather its name comes at random from a pool of terrestrial place names, with some exceptions made for craters near landing sites. Latitude and longitude are given as planetographic coordinates with west longitude.