洲ひじ

noun

mid-ocean sandbank

Archaic term for a sandbank or shoal in the open sea; not used in modern Japanese outside of historical or literary contexts.

• 古ふるい海かい図ずには「洲ひじ」と記しるされた浅あさ瀬せがいくつも見みられる。

  On old nautical charts, many shoals marked as '洲' can be seen.