seat of government of Kalamansig was formerly the municipality of Lebak. The first attempt to separate was on Lebak (presently Kalamansig) was under the municipal district of Kiamba while Salaman (now Lebak) use under the district of Dinaig on August 18, 1947, under Executive Order No. 82. and it was again reunited under one independent municipality of Lebak on December 31, 1948. The seat of government was transferred to Salaman on April 12, 1951. Ten years later, the Municipality of Kalamansig formally created by the virtue of Executive Order No. 459 dated December 29, 1961 signed by Carlos P. Garcia, creating the municipality of Kalamansig from certain barangays of Lebak and Palimbang. There are 20 barangays and sitios carved out from Lebak: Lun, Pitas, Dansalan, Pedtegenan, Madu, Port Lebak, Lenek, Santa Clara, Sebayor, Nalilidan, Bosawon, Calubcub, Camp III, Poral, Limulan, Simsiman, Cadiz and Tipudos. The 8 barangays and sitios were taken from Palimbang are Sangay, Mat, Danawan, Paril, Babancao, Basiawan, Narra and North Kulaman. Kalamansig was transferred from Cotabato Province to Province of Sultan Kudarat on November 22, 1973, by Presidential Decree No. 341 by President Ferdinand Marcos. Kalamansig lies the few miles from the epicenter of the devastating 1976 Moro Gulf earthquake. In 2004, gigantic shipworms were discovered by the locals within the municipal waters. In 2017, the shipworms were formally researched on by local and international scientists. The research confirmed that the giant Kalamansig tamilok is kuphus polythalamia and is the largest species of its kind in the world. Due to the research, Kamalansig became the first and only known permanent natural habitat of the endangered species. Geography Kalamansig is a coastal municipality located to west of Sultan kudarat. Limulan River is the longest river in Kalamansig with a total length of . Barangays It is politically subdivided into 15 Barangays: Bantogon Cadiz Datu Ito Andong Datu Wasay Dumangas Nuevo Hinalaan Limulan Nalilidan Obial Pag-asa (Sultan Gunting Mopak) Paril Poblacion Sabanal Sangay Santa Clara Santa Maria Climate Demographics Economy Education Elementary Datu Guiabar Pilot School/DGPS (Barangay Poblacion), Kalamansig District I Ricardo Cabaluna Memorial Elementary School/ RCMES (Barangay Sangay), Kalamansig District II R.D. Talapian Sr. Memorial Elementary School/ RDTSMES (Barangay Paril), Kalamansig District II Teresita Patalinjug Elementary School/TPES (Barangay Cadiz), Kalamansig District I Artemio L. Martin Elementary School/ALMES (Barangay Obial), Kalamansig District I Santa Clara Central Elementary School/ SCES (Barangay Santa Clara), Kalamansig District II Nalilidan Elementary School/NES (Barangay