Contrary to popular belief that all beaches in Singapore are artificially reclaimed, two stretches of natural shorelines remain today at Changi and Sembawang. Changi Beach is made of sand, pebble, peat and clay that were deposited during the Middle or Late Holocene. This sedimentary composition is otherwise known as the Kallang Formation and can be found at other coastal areas in Singapore. Changi Beach itself has been a popular venue for kite-flying, fishing and picnics among locals since the good old days. However, this depositional landform holds a grim history as the former killing grounds for the Sook Ching massacre during the Japanese Occupation. A war monument has been constructed at the site to remember the 66 Chinese male civilians who lost their lives back then.