Lua error in Module:Unicode_data at line 293: attempt to index local 'data_module' (a boolean value)., also known as Yezo or Yeso, is an ancient Japanese name for the lands to the north of Japan. It was the name of the northern Japanese island of Hokkaidō. It was also used as a name for islands in the Sea of Okhotsk, including the Kurile Islands and Sakhalin.