The book by Peter Ackroyd subtitled 'Sacred River' is about the history of which river?

Peter Ackroyd, CBE, FRSL (born 5 October 1949) is an English biographer, novelist and critic with a particular interest in the history and culture of London. For his novels about English history and culture and his biographies of, among others, William Blake, Charles Dickens, T. S. Eliot and Sir Thomas More, he won the Somerset Maugham Award and two Whitbread Awards. He is noted for the volume of work he has produced, the range of styles therein, his skill at assuming different voices and the depth of his research.

Peter Ackroyd's bestselling London is the biography of the city, Thames: Sacred River is the history of the river, from sea to source. Exploring its history from prehistoric times to the present day, the reader is drawn into an extraordinary world, learning about the fish that swim in the river and the boats that ply its surface; about floods and tides; haunting and suicides; miasmas and malaria; locks, weirs and embankments; bridges, docks and palaces.

Peter Ackroyd has a genius for digging out the most surprising and entertaining details, and for writing about them in the most magisterial prose; the result is a wonderfully readable and captivating guide to this extraordinary river and the towns and villages which line it.