Windsor is a town on the River Thames in southeast England, just west of London. It’s home to Windsor Castle, a residence of the British Royal Family. The River Thames flows through the whole of the Royal Borough and it is along or near the river that many of its historic and attractive towns and villages can be found. The River Thames is the cleanest river in the world that flows through a major city. This is a major feat considering that fifty years ago the river was so polluted that it was declared biologically dead.