The island directly east of the Formosa Strait is Taiwan.
Russia
That would be Taiwan.
Stewart Island is separated from the South Island by Foveaux Strait.
The Formosa or Taiwan Strait is a stretch of water between the mainland of Asia and the Island of Taiwan. It is about 110 miles wide.
Rakiura / Stewart Island.
Vancouver island is separated from the state of Washington by the Strait of Juan de Fuca. Vancouver island is the largest island in British Columbia.
Anglesea
Taiwan or Formosa strait
Rakiura Stewart Island.
The island nation you are referring to is Taiwan, which lies east of the Taiwan Strait. Historically, Taiwan was often referred to as Formosa, a name given by Portuguese explorers in the 16th century. The term "Formosa" means "beautiful" in Portuguese, highlighting the island's natural beauty.
Morocco is the African country separated from Europe by the Strait of Gibraltar, which connects the Atlantic Ocean to the Mediterranean Sea.