Most registered pirate attacks take place near the southern tip of this landmass.
On this non-island landmass, the Batek negritos and the Senoi are three of the Orang Asli indigenous groups. Most registered pirate attacks take place near the southern tip of this landmass. The Tenasserim mountains run the entire length of this peninsula, whose narrowest part is at the (*) Kra Isthmus, through which the Phuket mountains pass. Thailand controls most of this peninsula, which is separated by the Straits of Malacca from Sumatra. For 10 points, name this peninsula which shares its name with the majority ethnicity in Kuala Lumpur.
On this non-island landmass, the Batek negritos and the Senoi are three of the Orang Asli indigenous groups.
Malay peninsula [or Malaya; or Semenanjung Tanah Melayu; or Kra Peninsula before "Kra" is read; prompt on Southeast Asia or less specific answers]