Where can you find the serial number on a travel document?

The serial number on a travel document, such as a passport or visa, is typically located on the identification page or the data page. It is often printed in a machine-readable format at the bottom of the page or may be found near the personal information section. In passports, it is usually a combination of letters and numbers, while in visas, it may appear prominently at the top or bottom of the document. Always check the specific guidelines for the type of travel document you have, as the location can vary.