那空是贪玛叻（泰语：นครศรีธรรมราช）也称洛坤，位于泰国南部马来半岛，是那空是贪玛叻府的首府。也可能是中国古籍上记载的“登流眉国(亦称单马令，Tambralinga)”。

那空是贪玛叻（洛坤）是南部的第二大府，在Srivijaya时期是占统治地位的佛教之地，距曼谷780公里，面积9942平方公里，西部是高原和山脉，地势西高东低，在沿着泰国湾海岸线成为一个盆地。

除了其悠久的历史以外，洛坤（那空是贪玛叻）值得自豪的是翠绿的原始森林和丰富的植被，并以风景如画的海滩和优美的瀑布着称。

Nakhon Si Thammarat (Thai:นครศรีธรรมราช, pronounced [náʔkʰɔːn sǐː tʰammarâːt], alternative English transliteration: Nakhon Sri Thammarat from Pali Nagara Sri Dhammaraja) is a city (thesaban nakhon) in southern Thailand, capital of the Nakhon Si Thammarat Province and the Nakhon Si Thammarat District. It is about 610 km (380 mi) south of Bangkok, on the east coast of the Malay Peninsula. The city was the administrative center of southern Thailand during most of its history. Originally a coastal city, silting moved the coastline away from the city. The city has a much larger north to south extension than west to east, which dates back to its original location on a flood-save dune. The modern city centre on the train station is north of Old Town. As of 2005, the city had a population of 105,417. The town lies 783 km south of Bangkok.