Question: What is known as the Kingdom and the National Route 13 stretches towards the border?

Context paragraphs:
Cambodia: Cambodia ( ; Khmer: កម្ពុជា , or Kampuchea ] ), officially known as the Kingdom of Cambodia (Khmer: ព្រះរាជាណាចក្រកម្ពុជា , "Preăh Réachéanachâk Kâmpŭchéa", ] ), is a country located in the southern portion of the Indochina Peninsula in Southeast Asia.  It is 181035 km2 in area, bordered by Thailand to the northwest, Laos to the northeast, Vietnam to the east, and the Gulf of Thailand to the southwest.

National Route 7 (Vietnam): National Route 7 (Vietnamese: "quốc lộ 7" ), formerly called National Route 7A (QL7A) is a national highway in Vietnam which runs entirely in Nghệ An Province, North Central Vietnam.  The 225 kilometer-long route runs from Diễn Châu (Diễn Châu District) northwestward across Yên Thành, Đô Lương, Anh Sơn, Con Cuông, Tương Dương, Kỳ Sơn districts and reach Laos-Vietnam border at Nậm Cắn.  In Nậm Cắn, National Route 7 connects with National Route 7 of Laos.

Japan National Route 129: National Route 129 is a national highway of Japan connecting Hiratsuka, Kanagawa and Sagamihara, Kanagawa in Japan, with a total length of 31.7 km (19.7 mi).  It junctions with the following routes: Japan National Route 16 in Sagamihara, Route 412 (Japan) and Japan National Route 246 in Atsugi, Kanagawa, and Japan National Route 1 and Japan National Route 134 in Hiratsuka, Kanagawa.  Asides from the route running north to south, it also spans along some major highways: Harataima, Kenoatsugi and Ebina, Kanagawa IC in Keno Expressway, Atsugi, Kanagawa IC in Tōmei Expressway, Atsuginishi in Odawara-Atsugi Road road and Samukawaminami in Shin-Shōnan Bypass

Indonesian National Route 13: Indonesian National Route 13 is a road in the national route system, and its course is entirely within the borders of the DKI Jakarta province.  It's 15 kilometre path goes alongside with Java's arterial highway route, the Indonesian National Route 1, and is also indirectly connected to another route, that being the Indonesian National Route 2.

Missouri Route 413: Route 413 is a highway in Missouri running between Route 13 in Springfield and Route 13 in Reeds Spring.  It is an older alignment of Route 13 which was later rerouted.  Except for two sections (in Springfield between Route 13 and U.S. Route 60 and about a mile between US 60 and Route 265 southwest of Billings), the road is runs concurrent with other designations for its entire length.

Route 13 (Laos): Route 13 is the most important highway in the country of Laos.  It begins at Boten in the North of Laos at the Chinese border.  It connects the city of Vientiane to Luang Prabang in the north and roughly follows the line of the Mekong River down to the border with Cambodia.  The road then continues at National Highway 7 in Cambodia.  Also this national highway leads past all three international airports in Laos Vientiane Airport, Luang Prabang Airport and Pakse Airport.  Between Boten and Nateuy the Route 13 is at a length of 20 km part of the Kunming-Bangkok Expressway, which is also part of the Asian Highway AH3.  From Nateuy to Vientiane, the Route 13 is part of the AH12 and from Vientiane to the border of Cambodia AH11.

National Route 8 (Vietnam): National Route 8 (Part of AH15 ) is a highway in Hà Tĩnh Province in North Central of Vietnam, which is managed and maintained by the central government.  The route includes two segments.  The 85.3 km-long segment from Hồng Lĩnh Township across Đức Thọ and Hương Sơn districts is called National Route 8A.  There are 36 bridges in this route in which the two longest are Linh Cảm (crosses La River) and Hà Tân bridges.  National Route 8A crosses Annamite Range and connects to National Route 1A, Ho Chi Minh Highway and Lao National Route 8.

National Route 13 (Vietnam): National Route 13 (Vietnamese: "Quốc lộ 13" ) is a highway in southern Vietnam stretching from the northeastern outskirts of Ho Chi Minh City, the commercial centre of the country, towards the border to Cambodia.  The highway starts around Thủ Đức on the northern outskirts of Ho Chi Minh City, once the site of the military academy of the Army of the Republic of Vietnam, and travels north through the provinces of Bình Dương and Bình Phước.  The highway passes through the districts of Thuận An, Thủ Dầu Một town, Bến Cát, Chơn Thành, Đồng Phú, Bình Long, and Lộc Ninh.

Gangbyeonbuk-ro: The Gangbyeon Expressway (Korean: 강변북로 ) is an eight-lane highway located in Seoul, South Korea.  It is part of National Route 46 and National Route 77.  This route connects Seoul from Goyang to Namyangju, with a total length of 37.37 km .  The highway is directly connected with the Jayu Motorway (자유로) in the border city located on the Gayang Bridge.  The Mapo Bridge–Namyangju section has been designated as National Route 46, while the Yanghwa Bridge–Goyang section is specified as National Route 77.  The highway is the main arterial road that connects northern Seoul with satellite cities such as Goyang, Paju, and Namyangju.

Glen Osmond, South Australia: Glen Osmond is a suburb of Adelaide, South Australia in the City of Burnside which is in the foothills of the Adelaide Hills.  It is well known for the road intersection on the western side of the suburb, where the South Eastern Freeway (National Route M1) from the Adelaide Hills and the main route from Melbourne splits into National Route A17 Portrush Road (north, the main route towards Port Adelaide), Glen Osmond Road, Adelaide (northwest towards Adelaide city centre) and state route A3 Cross Road west towards the coast and southern suburbs.

Supporting paragraphs: National Route 13 (Vietnam) Cambodia
Answer: Cambodia