Getting around Bordeaux – a compact city that contains a dazzling mosaic of architectural styles – is a feast for the eyes. This is, after all, the world’s largest urban World Heritage Site, encompassing some 18 sq km (seven sq miles) – or half the city. Since time immemorial, vessels of various shapes and sizes have navigated the mud-brown Garonne River that winds gracefully through the port city, into the Garonne Estuary and beyond into the Atlantic Ocean.