Hokkaido (北海道 Hokkaidō, literally “Northern Sea Circuit”), formerly known as Ezo,Yezo, Yeso, or Yesso, is the second largest island of Japan, and the largest and northernmost prefecture. TheTsugaru Strait separates Hokkaido from Honshu. The two islands are connected by the underwater railway Seikan Tunnel. The largest city on Hokkaido is its capital, Sapporo, which is also its only ordinance-designated city.