Question: Pongdong Station is a railway station located in Pongsan County, North Hwanghae province, North Korea, in operational reality it ends at Kaesŏng due to the Korean Demilitarized Zone, informally known as the 38th Parallel, is a strip of land running across which location?

Context paragraphs:
Hungsu Station: Hŭngsu Station is a railway station located in Hŭngsu-ri, Pongsan County, North Hwanghae province, North Korea.  It is on located on the P'yŏngbu Line, which was formed from part of the Kyŏngŭi Line to accommodate the shift of the capital from Seoul to P'yŏngyang; though this line physically connects P'yŏngyang to Pusan via Dorasan, in operational reality it ends at Kaesŏng due to the Korean Demilitarized Zone.

Chonggye Station: Ch'ŏnggye Station is a railway station located in Pongsan County, North Hwanghae province, North Korea.  It is on located on the P'yŏngbu Line, which was formed from part of the Kyŏngŭi Line to accommodate the shift of the capital from Seoul to P'yŏngyang; though this line physically connects P'yŏngyang to Pusan via Dorasan, in operational reality it ends at Kaesŏng due to the Korean Demilitarized Zone.

Taebaeksansong Station: Taebaeksansŏng Station is a railway station located in Sansŏng-ri, P‘yŏngsan County, North Hwanghae province, North Korea.  It is on located on the P'yŏngbu Line, which was formed from part of the Kyŏngŭi Line to accommodate the shift of the capital from Seoul to P'yŏngyang; though this line physically connects P'yŏngyang to Pusan via Dorasan, in operational reality it ends at Kaesŏng due to the Korean Demilitarized Zone.

Pongdong Station: Pongdong Station is a railway station located in Pongsan County, North Hwanghae province, North Korea.  It is on located on the P'yŏngbu Line, which was formed from part of the Kyŏngŭi Line to accommodate the shift of the capital from Seoul to P'yŏngyang; though this line physically connects P'yŏngyang to Pusan via Dorasan, in operational reality it ends at Kaesŏng due to the Korean Demilitarized Zone.

Chimchon Chongnyon Station: Ch'imch'on Ch'ŏngnyŏn Station (Chosŏn'gŭl: 침촌청년역 ) is a passenger railway station located in Ch'imch'ol-li, Hwangju County, North Hwanghae Province, North Korea.  It is on located on the P'yŏngbu Line, which was formed from part of the Kyŏngŭi Line to accommodate the shift of the capital from Seoul to P'yŏngyang; though this line physically connects P'yŏngyang to Pusan via Dorasan, in operational reality it ends at Kaesŏng due to the Korean Demilitarized Zone.

Munmu Station: Munmu Station is a railway station located in Munmu-ri, Sŏhŭng County, North Hwanghae province, North Korea.  It is on located on the P'yŏngbu Line, which was formed from part of the Kyŏngŭi Line to accommodate the shift of the capital from Seoul to P'yŏngyang; though this line physically connects P'yŏngyang to Pusan via Dorasan, in operational reality it ends at Kaesŏng due to the Korean Demilitarized Zone.

Korean Demilitarized Zone: The Korean Demilitarized Zone (DMZ; Hangul: 한반도 비무장 지대 ; Hanja: 韓半島非武裝地帶 ), informally known as the 38th Parallel, is a strip of land running across the Korean Peninsula.  It is established by the provisions of the Korean Armistice Agreement to serve as a buffer zone between the Democratic People's Republic of Korea (North Korea) and the Republic of Korea (South Korea).  The Demilitarized zone (DMZ) is a border barrier that divides the Korean Peninsula roughly in half.  It was created by agreement between North Korea, China and the United Nations in 1953.  The DMZ is 250 km long, and about 4 km wide.

Tongsariwon Station: East Sariwŏn Station (or Tongsariwŏn Station) is a railway station located in Sariwŏn, North Hwanghae province, North Korea.  It is on located on the P'yŏngbu Line, which was formed from part of the Kyŏngŭi Line to accommodate the shift of the capital from Seoul to P'yŏngyang; though this line physically connects P'yŏngyang to Pusan via Dorasan, in operational reality it ends at Kaesŏng due to the Korean Demilitarized Zone.

Mulgae Station: Mulgae Station is a railway station located in P‘yŏngsan County, North Hwanghae province, North Korea.  It is on located on the P'yŏngbu Line, which was formed from part of the Kyŏngŭi Line to accommodate the shift of the capital from Seoul to P'yŏngyang; though this line physically connects P'yŏngyang to Pusan via Dorasan, in operational reality it ends at Kaesŏng due to the Korean Demilitarized Zone.

Hukkyo Station: Hŭkkyo Station is a railway station located in Hŭkkyo-ri, Hwangju county, North Hwanghae province, North Korea.  It is on located on the P'yŏngbu Line, which was formed from part of the Kyŏngŭi Line to accommodate the shift of the capital from Seoul to P'yŏngyang; though this line physically connects P'yŏngyang to Pusan via Dorasan, in operational reality it ends at Kaesŏng due to the Korean Demilitarized Zone.

Supporting paragraphs: Pongdong Station Korean Demilitarized Zone
Answer: Korean Peninsula