Pangalanes Canal

The Canal des Pangalanes is a canal that consists of a series of natural rivers, waterways and human-made lakes that extends for over 654 kilometres and runs down the east coast of Madagascar from Toamasina to Farafangana. It is used primarily for transportation and fishing, and it has unspoiled natural beaches that are visited by tourists. An initial area of the canal in Toamasina is straight, while subsequent areas have curves, lagoons, connected lakes and swamps.

Source: Wikipedia