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Zamyn-Üüd (Mongolian: Замын-Үүд; ᠵᠠᠮ ᠤᠨ ᠡᠭᠦᠳᠡ, road's gate) is a sum (district) of Dornogovi Province in southeastern Mongolia.
The population of Zamyn-Üüd was 11,527 in 2008.
Zamyn-Üüd's actual name comes from the former Dzamiin Üüde settlement located 101 kilometres (63 mi) northwest from the modern town (44°30′N 111°15′E).
The town is located on the old trade route between Beijing and Urga/Ulaanbaatar, and is now the most important border crossing between Mongolia and the People's Republic of China, via Erlian. The border control counted more than 950,000 border crossings in 2004. In April 2007, the construction of a 432 kilometres (268 mi) paved road from Choir to Zamyn-Üüd via Sainshand began. Completion is planned for October 2007. However, completion of the road project was pushed back to 2013, with Sainshand to Choir section being finished in September, 2013. A new expanded road border crossing was also completed in 2013 to relieve delays in crossing from China to Mongolia.
The "Zamyn-Uud" Free Economic Zone was officially created in 2004. It has an area of 900 ha and is located between Zamyn-Üüd settlement and the Chinese border
Zamyn-Üüd has a cold desert climate (Köppen climate classification BWk) with very warm summers and very cold winters. Most precipitation falls in the summer as rain, with some snow in the adjacent months of May and September. Winters are very dry.