evidence: Laos is a country in and the only landlocked nation in mainland Southeast Asia, northeast of Thailand and west of Vietnam. It covers approximately 236,800 square kilometers in the center of the Southeast Asian peninsula and it is surrounded by Myanmar (Burma), Cambodia, the People's Republic of China, Thailand, and Vietnam. [...] The topography of Laos is largely mountainous, with the Annamite Range in the northeast and east and the Luang Prabang Range in the northwest, among other ranges typically characterized by steep terrain.[2] Elevations are typically above 500 metres with narrow river valleys and low agricultural potential.[2] This mountainous landscape extends across most of the north of the country, except for the plain of Vientiane and the Plain of Jars in the Xiangkhoang Plateau.[2] [...] - ^ "Klimatafel von Vientiane (Viangchan) / Laos" (PDF). Baseline climate means (1961–1990) from stations all over the world (in German). Deutscher Wetterdienst. Retrieved 23 January 2016.