Map of the City of Dublin, Ireland. Published in 1797, this map includes details of the canals being built at the time. Canal Harbour (lower right) connects across bottom with the Grand Canal (lower left). The Royal Canal (upper right and a branch at upper centre) was a competing canal. Running across centre is the River Liffey. Borders of the city's wards are marked in coloured lines, with a key at lower right, next to the city coat of arms. The scale at lower left is in both English and Irish miles. In 1797, Ireland was ruled by Britain, and this map was published by the geographer to King George III and the Prince of Wales (the future King George IV).