The Xin Tang Shu says in the article of Shi-li-fo-shi:
“The location of Shi-li-fo-shi(Srivijaya) is 2,000li (about 800km from the Con Son island, south of Ho Chi Ming city.The widthfrom east to west is 1,000 li (about 400 km) and the length is 4,000 li (about 1,600 km). Shi-li-fo-shi has forteen subordinate states and the administration is separated by two regions. The west neighbor is “Lang-Po-Lou-Si (郎婆露斯).” This “Lang-Po-Lou-Si” means the Nicobar Islands. So, apparently Shi-li-fo-shi is located in the Malay Peninsula. In the past very few historians could read “Lang-Po-Lou-Si” correctly. Japanese well known historian, Dr. Rokuro Kuwata had found that Ibn Khordãdzbeh and Suleymãn in the 9th century had used « Langga bãlūs “as the Nicobar islands. They say “From Sirandib(Sri Lanka 10 to 15 days journey, they arrived at Langabãlūs, and after 6 days’ journey at Kilah (Kedah).” So in the 9th century the Nicobar Islands were called “Langabãlūs” by Arab merchants.
Chinese officials followed the Arabic pronounciation about “Langga bãlūs”.
However Yi-Jing wrote the Nicobar Islands as “Naked People’ country”, because
the residents were naked.