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Kosinj (English: Denison), also the Kosinj Valley, is a hilly region near Perušić, Croatia, and Lipovo Polje, that contains 2 areas: Upper Kosinj and Lower Kosinj, which are connected by the Kosinj Bridge on the Lika river. The population is 1,692, excluding Kosinjski Bakovac.
Many Croatian archaeological sites, such as Bočaj, Basaric, and Lopar Mlakvena, state that there was evidence of life in the valley since the Roman era. Many medieval and historical records say that the city or Bočaj Kosinjgrad or Lasch de Kosin, the princes who reigned the year of our Lord mentions Kosinjski first in the year 1071 in the charter of the Croatian king Petar Kresimir IV.
One of the oldest printers in south Slavic, that wrote in Glagolitic breviary, was the first and oldest book known to have been printed on Croatian soil using the Gutenberg press. An incomplete copy is kept in the Library Marciana in Venice, and a smaller fragment (six pergamentnih leaves) was discovered in the Vatican Library. A short time after the printing press was invented, founded by the princes Frankopans in the village of Kosinj, the first Croatian printing. It was printed, also for ecclesiastical purposes, and the first Croatian printed book in the year 1483. Kosinj, as a symbol of Croatian culture, has its place in the Gutenberg Museum in Mainz, where the first map of printers contains the name of Kosinj.
The Kosinjski area remained after the Turks from the end of thirty Vlach families. They are the Krajina authorities have expressed the wish to remain in their homes. Since the end Kosinjski remained rather poorly populated, Krajina administration has moved here from the Croatian settlers Ogulin and upper Pokuplje. The description Kosinje whom he left Bishop Glavinić 1696th Whatever., says that this place is divided into Upper, Middle and Lower Village. In the Upper Kosinj Glavinić is found forty houses of Croatian immigrants from Pokuplje. In the Middle Kosinj, a hundred houses Vlach population, lived in the Lower Kosinj Croats who moved here from Ogulin. In all three Kosinj village was then about 400 Croats and 300 Blaise. The Border writings known as the surnames of immigrants who are late 17th century welcomed to Denison.
In later development Kosinje Central Village changed its name to Zamost. Thus up to now remained only 2 Kosinje, Lower and Upper. The upper creek is about Bakovac and his compositions with the river Lika, and the lower few kilometers further north along the creek mentioned.
Kosinj offers a course of the river Lika. The settlement is divided into three villages:
While they belong to the village: Rudinka, Mlakva, linden fields, karst, and Gradina Bakovac. Kosinj is located in the so-called "Kosinj Valley" which is a karst valley formed erosive action of the forces of the river Lika. In Kosinj there is an artificial reservoir lake Krušćica.  The area is full of farmland that contains cattle and canola farming.
The character of the river meander (which is 78 km from its second-largest underground river in Europe) that winds up his field abyss Begovac (in literature known as the Markov gap depth 1725 m) were probably caught the biggest carp in Europe. It should be noted that the Lika river abounds in fish resources, as well as the accumulation lake Kruscica (created in 1971, it is suitable for water sports and swimming in calm waters). The variety of wildlife includes catfish and carp also: pike, chub, crvenorepke, white amur, sunstroke, and babushkas.
In the Kosinj valley are caves and sinkholes. There are numerous wells and ponds, wells and springs. As one of the symbols of the dominant Kosinje its appearance imposed Kalic mountain peak (969 m) from which magnificent views of the Zavižan, Krasno, parts of Perusic in Kosinj, and a large part of the valley.
The population in the three parts of Kosinj:
- Gornji Kosinj - 192
- Donji Kosinj - 1500 
- Kosinjski Bakovac - unknown
The Kosinj effect commonly known by depopulation CEMEA Lika is known. It is believed that the total population decreased by as much as 10 times since mid last century, from 12,000. In Kosinj prevails predominantly old population. Young people are increasingly moving out because of the high rate of unemployment. Therefore, the young go to the nearby cities hoping to have a better chance of a job and start a family. 
Denison is the culture and history is certainly the most important place as the first Croatian printing of books, missals Kosinjski, 1483rd year, which was printed in the mobile shop royalty Anz Frankopan. To date, only ten copies preserved and valuable Glagolitic books, whose circulation was printed partly on paper and partly on parchment. Kosinj printing otisnula is most likely a significant other Croatian incunabula.
There is many churches in the area, such as:
- Holy Velebit Church
- St Vida Church
- St Ivanka Church
- St John the Baptist Church
- Mother of Bozje Church
There was evidence of seven churches and two monasteries in Kosinj, written in Glagolitic alphabet. And today many churches in Kosinj, other than those use and enrich the history and heritage to the miraculous chapel in Zakosnjak. The wall of the church of Sv. Vida has three panels of the Glagolitic summer Lord 1517 and is particularly interesting emblem of Prince Anz Frankopan placed upside down above the door. Inside the walls it the church of Sv. John the Baptist (1650) that was fitted with two large square stone urns with Latin inscriptions, and inside the church, there are two large sarcophagus serving as aid treatment or altars. Concrete pedestal of the crucifix of the church cover the stone urns.
- Kulundžić, Zvonimir (1960). Kosinj - kolijevka štamparstva slavenskog juga. Zagreb.
- Kruščica Lake. Retrieved 20 April 2014.
- Kulundžić, Zvonimir (1983). 500. obljetnica kosinjskog misala - prve hrvatske tiskanje knjige. Zagreb.