The River Thames, known alternatively in parts as the River Isis, is a river that flows through southern England including London. At 215 miles, it is the longest river entirely in England and the second-longest in the United Kingdom, after the River Severn.
Etymology: Proto-Celtic *tamēssa, possibly meaning "dark"
AdFull Refund if You Cancel at least 24 Hours in Advance. Book Now. Do More with Viator. Book Tours, Cruises, Tickets, Sightseeing Trips & More. Discover London with Viator.
Verified Reviews · Over 300,000 Experiences · Reserve Now & Pay Later
Destinations: Rome, Las Vegas, Paris, London, New York, Dubai, Barcelona, Athens