The western part of the isthmus belongs to Ranong Province and the eastern part to Chumphon Province, both in Thailand. The isthmus is bordered to the west by the Andaman Sea and to the east by the Gulf of Thailand.
The Kra Isthmus marks the boundary between two sections of the central cordillera, the mountain chain which runs from Tibet through the Malay peninsula. The southern part is called the Phuket chain, which is a continuation of the greater Tenasserim range, extending further northwards for over 400 km (250 mi) beyond the Three Pagodas Pass.
On 8 December 1941 local time, the Imperial Japanese Army landed near Songkhla, Thailand and Kota Bharu, Malaya, thus beginning the Pacific War, and launching both the invasion of Thailand and the Malayan campaign, the latter of which culminated in the capture of Singapore.
- "Kra, Isthmus of". Oxford Dictionaries. Oxford University Press. Archived from the original on 24 September 2015. Retrieved 14 April 2013.
- The Physical Geography of Southeast Asia, Avijit Gupta
- Parfitt, Allen. "Bicycle Blitzkreig The Japanese Conquest of Malaya and Singapore 1941-1942". MilitaryHistoryOnline.com. Retrieved 9 August 2012.
- Griffith University (23 March 2010). "Thai Canal Project: Over 300 years of conceptualising and still counting". Asian Correspondent. Hybrid News. Retrieved 14 April 2013.
- Loftus, Alfred John (1883). Notes of a journey across the Isthmus of Krà.