This current allows World Government and Marine ships to move between the three locations privately. It is located on the Grand Line in a corner where the adjacent Calm Belt and Red Line intersect. The three facilities form a triangle that surrounds the current. The only way to access the current is to enter through a facility's Gates of Justice. The "sides" of the triangle have several small currents that would sweep away any ship that tries to bypass the Gates and access the Tarai Current directly. On the other hand, any ship already inside the current would continually stay in it unless a Gate of Justice was opened to let it out.
The Buster Call on Enies Lobby reached its destination after 30 minutes, and Gloriosa states that one can reach Impel Down from Amazon Lily in one week without the Tarai Current and in 4 days with. These facts suggest that one can travel 3 days worth of distance in half an hour when using the gates.