The Garonne bisects Bordeaux along an 18th-century crescent the city's merchants called the Port de la Lune — Port of the Moon — a UNESCO World Heritage site recognized in 2007 for its unbroken neoclassical waterfront spanning two kilometres. Stone quays raised in the 1730s still frame the riverbank, their bollards and chains anchoring leisure craft where three-masted cargo ships once moored. Private boat tour Bordeaux departures now launch from Quai des Chartrons and Quai Richelieu, the original wine-trading wharves that supplied Europe's cellars and built the city's fortune on claret exports. The river itself shaped Bordeaux's commerce and military reach for two millennia. Romans navigated its tidal bore to establish Burdigala as a Garonne port in the first century; medieval English rule from 1154 to 1453 turned the waterway into a contested trade route; and Napoleon's continental blockade strangled the docks until peace restored wine shipments in 1815. Today the Garonne remains tidal, rising and falling two metres twice daily, its brackish current meeting Atlantic saltwater 90 kilometres downstream at the Gironde estuary. Operators schedule private boat tour Bordeaux tours around slack water at high tide, when the river runs slow and the stone facades stand fully reflected. Modern cruises trace the historic quays past the Place de la Bourse, whose 1730s symmetry architect Ange-Jacques Gabriel designed as a royal gateway to the river, and the Pont de Pierre, an 1822 bridge commissioned by Napoleon with 17 arches — one for each letter of his name. Evening departures align with the Miroir d'Eau's misting cycle, when the granite esplanade's shallow film mirrors the quayside lights. Most Garonne River cruises include Bordeaux wine service — often a Graves blanc or Médoc rouge — and canelé, the rum-and-vanilla custard pastry invented by Bordelaise nuns in the 18th century. Operators sail from 10:00 through sunset, with twilight sailings departing after 19:00 in summer months when daylight lingers past the city's UNESCO silhouette.