Tulips, windmills, chocolate, diamonds, and lace — Holland and Belgium have a lot going for them. Because these culture-rich countries are crisscrossed with waterways, river cruise operators offer a variety of itineraries in the region, each navigating a network of canals, deltas, and rivers both close to the North Sea and further inland. Most routes run between Amsterdam and Brussels, though some end in Antwerp and others leave round-trip from Amsterdam. Voyages typically last from four to 10 days; prime travel time coincides with peak tulip season in mid-April, though sailings are offered as late as July or September.