Question: The Turkish Vanhas been claimed to be descended from the landrace of usually which distinctive landrace of domestic cat, found in the Lake Van region of eastern Turkey?

Context paragraphs:
Lake Van Monster: The Lake Van Monster (Turkish: "Van Gölü Canavarı" ) is a lake monster that allegedly lives in Lake Van in eastern Turkey.

Bitlis: Bitlis (Armenian: Բաղեշ "Baghesh/Paghesh "; Kurdish: Bidlîs‎ ; Syriac: ܒܝܬ ܕܠܝܣ‎ "Beṯ Dlis "; Ottoman Turkish: بتليس‎ ; Medieval Greek: Βαλαλης "Balales") is a city in eastern Turkey and the capital of Bitlis Province.  The city is located at an elevation of 1,545 metres, 15 km from Lake Van, in the steep-sided valley of the Bitlis River, a tributary of the Tigris.  The local economy is mainly based on agricultural products which include fruits, grain and tobacco.  Industry is fairly limited, and deals mainly with leatherworking, manufacture of tobacco products as well as weaving and dyeing of coarse cloth.  Bitlis is connected to other urban centres by road, including Tatvan on Lake Van, 25 km to the northeast, and the cities of Muş (Mush), 100 km northwest, and Diyarbakır, 200 km to the west.  The climate of Bitlis can be harsh, with long winters and heavy snowfalls.  Summers are hot, and often humid.

Van, Turkey: Van (Kurdish: Wan‎ ; Ottoman Turkish: فان‎ ; Medieval Greek: Εύα , "Eua"; Armenian: Վան ) is a city in eastern Turkey's Van Province, located on the eastern shore of Lake Van.  The city has a long history as a major urban area.  It has been a large city since the first millennium BC, initially as the capital of the kingdom of Urartu in the 9th century BC and later as the center of the Armenian kingdom of Vaspurakan.  Today, Van has a Kurdish majority and a sizeable Turkish minority.

Turkish Van: The Turkish Van is a semi-long-haired breed of domestic cat, which was developed in the United Kingdom from a selection of cats obtained from various cities of modern Turkey, especially Southeast Turkey.  The breed is rare, and is distinguished by the Van pattern (named for the breed), where the colour is restricted to the head and the tail, and the rest of the cat is white; this is due to the expression of the piebald white spotting gene, a type of partial leucism.  A Turkish Van may have blue or amber eyes, or be odd-eyed (having one eye of each colour).  The breed has been claimed to be descended from the landrace of usually all-white Van cats (Turkish: "Van kedisi" ), mostly found near Lake Van, though one of the two original breeders' own writings indicate clearly that none of the breed's foundation cats came from the Van area, which has historically been in Armenia.

Van cat: The Van cat (Turkish: "Van kedisi" ; Armenian: Վանա կատու "Vana katou" , Western Armenian: "Vana gadou"; Kurdish: "pisîka Wanê"‎ ) is a distinctive landrace of domestic cat, found in the Lake Van region of eastern Turkey.  It is relatively large, has a chalky white coat, sometimes with ruddy coloration on the head and hindquarters, and has blue or amber eyes or is odd-eyed (having one eye of each colour).  The variety has been referred to as "the swimming cat", and observed to swim in Lake Van.

Lake Erçek: Lake Erçek (Turkish: "Erçek Gölü" ; Armenian: Արճակ լիճ ) is an endorheic salt lake in Van Province in eastern Turkey, about 30 km east of Lake Van.  The lake sits at an elevation of about 1,803 m , and has an area of 106.2 sqkm and a mean depth of 18.45 m .  The northern and western shores are steep and rocky, whereas the southern and eastern shores slope gently with mudflats and coastal plains.

Van Province: Van Province (Turkish: "Van ili" ) is a province in eastern Turkey, between Lake Van and the Iranian border.  It is 19,069 km in area and had a population of 1,035,418 at the end of 2010.  Its adjacent provinces are Bitlis to the west, Siirt to the southwest, Şırnak and Hakkâri to the south, and Ağrı to the north.  The capital is the city of Van.  The majority of the province's population is Kurdish.

Mount Süphan: Mount Süphan (Turkish: "Süphan Dağı" , Kurdish: Sîpanê Xelatê‎ , Armenian: Սիփան, "Sipan" ) is a stratovolcano located in eastern Turkey, immediately north of Lake Van.  It is the second highest volcano in Turkey, with an elevation of 4058 m , and has the second highest prominence of the Armenian Highland, after Mount Ararat.

Arabian Mau: The Arabian Mau is a formal breed of domestic cat, originated from the desert cat, a short-haired landrace native to the desert of the Arabian Peninsula.  It lives there in the streets and has adapted very well to the extreme climate.  The Arabian Mau is recognized as a formal breed by few fancier and breeder organization and cat registry, World Cat Federation (WCF) and Emirates Feline Federation (EFF).  Based on one landrace, the Arabian Mau it is a natural breed.

Lake Van: Lake Van (Turkish: "Van Gölü" , Armenian: Վանա լիճ, "Vana lič̣" , Kurdish: Gola Wanê‎ ), the largest lake in Turkey, lies in the far east of that country in the provinces of Van and Bitlis.  It is a saline soda lake, receiving water from numerous small streams that descend from the surrounding mountains.  Lake Van is one of the world's largest endorheic lakes (having no outlet) - a volcanic eruption blocked the original outlet from the basin in ancient times.  Although Lake Van has an altitude of 1640 m in a region with harsh winters, its high salinity prevents most of it from freezing, and even the shallow northern section freezes only rarely.

Supporting paragraphs: Turkish Van Van cat
Answer: Van cat