Arsenalna (Kyiv Metro) in the context of "Kyiv Metro"

Kyiv Mountains or Kyiv Hills (Ukrainian: Київські гори, Київські пагорби, romanized: Kyivski hory, Kyivski pahorby) is a term used in journalism and literature for hills and highlands around the city of Kyiv that range from approximately 150 to almost 200 meters. The city of Kyiv is located within borders of three orographic regions: Dnieper Upland (Cisdnieper Upland) and Polesian and Dnieper lowlands. The hills are located in northern part of the Kyiv plateau where the Dnieper Upland slopes down towards the Dnieper river valley and the Kyiv Polesia. The highest marks recorded in central and southwestern parts of the city (within the Dnieper Upland, particularly the Kyiv plateau).

Hilly landscape is the reason for the unusual depths and two-fold escalators of underground Kyiv Metro (subway) stations in the city center (with the deepest one, Arsenalna, measuring 105.5 metres).

The Sviatoshynsko–Brovarska line (Ukrainian: Святошинсько-Броварська лінія) is the first line of the Kyiv Metro, dating back to 1960. It includes some of the system's more historically significant stations, such as Arsenalna, which at 105.5 meters is the deepest in the world and the next station Dnipro, which although the tunnel follows a descent, appears above ground level.

All of the stations on the eastern bank of the Dnieper river are either ground or above ground level, this attributed to a similar experiment like Moscow's Filyovskaya line. Here the warmer Ukrainian climate prevented the stations there from being severely deteriorated, which was why extensions in 1968 and 1979 were kept from going underground. The five original stations are extremely beautiful in architecture and decoration as they managed to survive Nikita Khrushchev's struggle with decorative "extras".

Hongyancun station (Chinese: 红岩村站; pinyin: Hóngyáncūn zhàn) is a station on Line 9 of Chongqing Rail Transit in Chongqing Municipality, China, that opened in 2022. It is located in Yuzhong District. Line 5 also reaches the station since November 2023.

The station is the deepest metro station in the world. The deepest point of the station is 116 meters (381 ft) below the ground and the top of rail is 106 meters (348 ft) below the surface. Regardless, the depth breaks China's previous record depth of Line 10's Hongtudi station and surpasses the depth of the Kyiv Metro's Arsenalna station, the previous record for deepest metro station.