The island is roughly heart-shaped, cut through by a
millrace. On the islet is
The Mill at Sonning, a restored 18th-century
watermill on a medieval site, now converted to a
dinner theatre. The millrace runs through what is now the theatre bar, and powers a small turbine powering an 18.5 kW
hydroelectric generator that supplies the
National Grid. Set behind this on the island is
Mill House, a
Grade II listed building owning some of the island. It was originally built in the 17th century and once owned by the wealthy Rich family, Lords of the Manor of Sonning, hence owning its manor house towards the top of Sonning's Thames Street as well.
Sir Thomas Rich founded
Sir Thomas Rich's School just south of here in 1766 by endowing it with the income with his neighbouring farmland. In 2014, the Mill House was bought by the American film star
George Clooney and his British wife, human rights lawyer
Amal Alamuddin, at a cost of around £10 million. ==Paintings and sketches==