What is grand line map?

The Grand Line is a fictional ocean in the world of One Piece, a popular manga and anime series. The Grand Line is characterized by unpredictable weather patterns, dangerous sea creatures, and powerful pirates. The map of the Grand Line is divided into two halves, with the first half known as "Paradise" and the second half known as the "New World". The map features a series of islands, each with its own unique landscape, climate, and inhabitants. To navigate the Grand Line, sailors must follow a specific route called the Log Pose, which uses a special compass to track the changing magnetic fields of different islands. The Grand Line is also home to several legendary treasures, including the One Piece itself, which is said to be hidden somewhere on the final island at the end of the New World.