The Ainu is a major ethnic group on this island, with capital at Sapporo.
Before 1869, it was named Yezo, and William Clark led a 19th-century Christian movement in this location. Mount Meakan is a volcano in this island's Akan National Park, and cities on this island include Nemuro and [*] Hakodate. The Seikan Tunnel, the world's longest underwater tunnel, connects this island to the rest of its country. The Ainu is a major ethnic group on this island, with capital at Sapporo. For 10 points, name this northernmost island of Japan.
Before 1869, it was named Yezo, and William Clark led a 19th-century Christian movement in this location.
{Hokkaido} [do not prompt “Japan” at any point]