Kesselaid (also Kessulaid, or diminutively Kessu. German: Schildau; Swedish: Sköld, Skölldo) is a 1.7 km2 (0.66 sq mi) Estonian islet located between the mainland and the island of Muhu in the Suur väin (Big Strait) which connects the Väinameri strait and the Gulf of Riga. There's only one village on the island Kesse, which is administratively part of Muhu Parish, Saare County. With the highest point 15.6 m above sea level it's the highest islet of Estonia. It is also considered to be the oldest islet, it arose around 3000 BC.