As of 2026, the Suica card—issued by JR East—is one of Japan’s most versatile "IC cards," providing seamless access to a vast network of transportation. Primarily, it covers all JR East lines in the Greater Tokyo area, Sendai, and Niigata. However, due to the nationwide mutual integration of IC cards, your Suica also works on almost all major transit systems across Japan. This includes the Tokyo Metro and Toei Subway, the Tokyo Monorail to Haneda Airport, and private rail lines like Odakyu and Keio. Beyond Tokyo, you can use Suica for local trains and buses in cities like Osaka (ICOCA area), Kyoto, Nagoya (TOICA/manaca), and Fukuoka (SUGOCA/nimoca). It is important to note that while Suica covers the "base fare" for travel, you cannot use it for "continuous travel" between different regions (e.g., you can't tap in at Tokyo and tap out at Osaka). For high-speed Shinkansen travel, you must link your Suica to a "Touch-Go! Shinkansen" registration or use the SmartEX app. In 2026, mobile Suica is the standard for most travelers, allowing for instant top-ups and use at millions of convenience stores and vending machines nationwide.