Longnan () is a county-level city under the jurisdiction of Ganzhou Municipality, in the far southwest of Jiangxi province, China, bordering Guangdong province to the south.
In the present, Longnan City has 8 towns and 5 townships.
Longnan is notable for the variety of traditional Hakka walled villages in Jiangxi. By one count, there are around 370 of them within the city's boundaries. They are known locally as weiwu () or wei ().
Longnan is also regarded as "the Hometown of Weiwu in China" æÂ°åÂÂç½Â-客家å´å±Âä¹Â乡. Some of the most famous weiwu are Guangxi Wei ç¾度ç¾ç§Â-堳西å´屠and Yanyiwei.堳西å´å±Âä¸ÂçÂÂ翼å´ Some researchers call them "Jiangxi tulou" (literally, "[tall] earthen buildings"), as opposed to the better known Fujian tulou.