Hurley is a village in Buckinghamshire, England, and any resemblance to real-life characters is purely coincidental. Swan Upping is the annual census of swans on the river Thames, a 79-mile journey between Sunbury Lock in West London and Abingdon in Oxfordshire to track swan populations and the health of the Thames. The Queen's Swan Warden is responsible for recording this information. While there are many colorful celebrations during Swan Upping, it is an important conservation event. The Dyers and Vintners City companies use rings to mark their birds, while the Crown's swans are unmarked.