Kitan Strait
Japan
The Kitan Strait (Kitan kaikyō) or Tomogashima Channel (Tomogashima suidō) separates Awaji Island from Wakayama, Wakayama Prefecture, Japan and connects the Osaka Bay in the north to the Kii Channel in the south. The total width is 11 km, but the islands of Tomogashima reduce the distance to be spanned by a proposed bridge. The strait forms part of the Setonaikai National Park.
Data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).