Twin Cape

Twin Cape is located at the bottom of Reverse Mountain, at the exit that leads into the Grand Line. The area is located precisely where the Red Line and the Grand Line meet. From this place is where one can choose one of the seven routes of the Grand Line by waiting for the Log Pose to set on the desired one.

Lighthouse
The lighthouses are located at the entrance and exit of Reverse Mountain, and are where the Reverse Mountain Arc took place. Crocus has been the caretaker of the lighthouse at the exit for at least 52 years, taking care of Laboon as well, minus the three years he spent as the doctor of the Roger Pirates.

Trivia
According to Nami in Chapter 22, there is a city at Twin Cape. However, this was changed to a lighthouse.

Navigation
Futago Cabos_Gemelos Cap des Jumeaux