or informal workers, temporary workers, and even stateless people, and a large expatriate population which is not included. Most of Southern Thailand is in Tenasserim-South Thailand semi-evergreen rain forests ecoregion. The Peninsular Malaysian rain forests and Peninsular Malaysian montane rain forests ecoregions extend into southernmost Thailand along the border with Malaysia. History The Malay peninsula has been settled since prehistoric times. Archeological remains were found in several caves, some used for dwellings, others as burial sites. The oldest remains were found in Lang Rongrien Cave, dating 38,000 to 27,000 years before present, and in the contemporary Moh Khiew cave. In the first millennium Chinese chronicles mention several coastal cities or city-states. No exact geographical locations were recorded, so the identification of these cities with later settlements is difficult. The most important of these states were Langkasuka, usually considered a precursor of the Patani Kingdom; Tambralinga, probably the precursor of the Nakhon Si Thammarat Kingdom, or P'an-p'an in Phunphin district, Surat Thani, probably located at the Bandon Bay Tapi River. The cities were highly influenced by Indian culture, and have adopted Brahman or Buddhist religion. When Srivijaya in Chaiya extended its sphere of influence, those cities became tributary states of Srivijaya. The city Chaiya in Surat Thani Province contains several ruins from Srivijaya times, and was probably a regional capital of the kingdom. Some Thai historians even claim that it was the capital of the kingdom itself for some time, but this is disputed. After Srivijaya lost its influence, Nakhon Si Thammarat became the dominant kingdom of the area. During the rule of King Ramkhamhaeng the Great of Sukhothai, Thai influence first reached Nakhon Si Thammarat. According to the Ramkhamhaeng inscription, Nakhon Si THammarat was a tributary state of Sukhothai. During most of later periods, Nakhon became a tributary of Ayutthaya. The deep south belonged to the Malay sultanates of Pattani and Kedah, while the northernmost part of the peninsula was under the control of Bangkok. During the Thesaphiban reforms at the end of the 19th century, both Nakhon Si Thammarat and Pattani were incorporated into the central state. The area was subdivided into 5 monthon, which were installed to control the city states (mueang). Minor mueang were merged into larger ones, thus forming the present 14 provinces. With the Anglo-Siamese Treaty of 1909 the boundary to Malaysia was fixed. Kedah came under British control, while Pattani stayed with Siam. Languages