The Paddan fleet takes its name from the Swedish word for toad, chosen for vessels designed to crouch beneath bridges built barely a metre above the waterline. Constructed during Gothenburg's 17th-century expansion, the central canals were dug as defensive moats and commercial arteries, linking the harbour to inland trade routes. When the city's fortifications became obsolete in the 19th century, engineers lowered the canal floors to accommodate larger cargo boats, creating the claustrophobic clearances that define the Paddan canal tour Gothenburg experience today. On 20 occasions during the standard route, passengers instinctively duck as the flat-topped boat slips under stone arches with centimetres to spare, the hull scraping past moss-covered pylons that have stood since the Swedish Empire controlled Baltic trade. Today the canals form a 50-minute loop threading past landmarks invisible from street level: the rear façades of Stora Teatern, the ivy-clad warehouses of Vallgraven, and the Art Nouveau balconies overlooking Rosenlundskanalen. The route follows the original moat system before diverging onto the Säveån River, where industrial brick gives way to parkland and the water widens beneath willow branches. Audio commentary in six languages recounts the 1621 founding charter, the 1807 canal expansion, and the 1960s preservation campaign that saved the waterways from being paved over for car traffic. Departures run hourly from Kungsportsplatsen, the central square where ticket kiosks line the canal edge and glass-topped boats idle between trips. The Paddan operators maintain eight identical vessels, each seating 22 passengers on wooden benches arranged in four rows. No upper deck exists; the entire journey unfolds at water level, where the smell of algae mixes with diesel exhaust from passing cars on the bridges overhead. During summer months a ninth vintage boat from 1968 joins the rotation, its varnished teak hull and brass fittings preserved as a floating museum piece. The ticketing system allows walk-up purchases until 16:00, though weekend sailings between May and August fill an hour in advance. Winter service reduces to three departures daily, and ice occasionally halts operations for weeks when temperatures drop below minus ten. The boats carry no toilets or refreshments, and the open-air design offers no shelter from rain.