Japan's capital city Tokyo has the busiest metro system in the world, followed by Moscow and Shanghai, according to figures from Union Internationale des Transports Publics (UITP), a nonprofit organization that promotes public transport worldwide.
UITP collected data on the world's metro systems based on a series of key indicators including ridership, number of lines, network length, numbers of stations and fleet size.
Asia is home to seven of the top 10 busiest metros, according to the report. Four cities from China made this year's top 10, with Shanghai ranked in third place, followed by Beijing in fourth place, Guangzhou in eighth place and Hong Kong in 10th place.
Let's take a look at the 10 busiest metros in the world.
No 10 Hong Kong
A driverless metro train arrives at the Ocean Park Station in Hong Kong, China, Dec 24, 2016.
No 9 Mexico City
Women wait to board the Women-Only passenger carriages at a metro station in Mexico City, Mexico, June 16, 2017.
No 8 Guangzhou
Interior view of the Nansha Passenger Port Subway Station on the Metro Line 4 in Guangzhou, South China's Guangdong province, Dec 28
No 7 New Delhi
A man is seen walking inside the tunnel at Palam metro station, an underground metro station on the Magenta Line on April 20, 2018 in New Delhi, India
No 6 New York
Commuters ride the L train during the rush hour in New York, Jan 14, 2019.
No 5 Seoul
Advertisements of the Samsung Electronics' Galaxy S9 and S9+ smartphone are displayed at a subway station in Seoul, April 6, 2018.
No 4 Beijing
Interior view of the Liaogongzhuang Station on the Metro Line 6, which went into trial operation recently, in Beijing, Jan 3, 2019
No 3 Shanghai
Interior view of the Chenchun Road Station on the Phase 2 and 3 of Shanghai Metro Line 13 in Shanghai, Jan 3, 2019
No 2 Moscow
Passengers walk along a staircase as a train moves at Partizanskaya metro station in Moscow, Russia, Jan 6, 2019
No 1 Tokyo
Kamamon wrapping train runs on the Tokyo Metro Ginza Line at Omotesando Station in Shibuya Ward, Tokyo on March 6, 2018
