Ko Sichang is in the Gulf of Thailand, 12 km off the shore of Si Racha district.

The royal residence was largely abandoned in 1893 after the French occupied the island during a conflict with Thailand over control of neighboring Laos.

He reported that Francis Buchanan-Hamilton called the islands of Ko Sichang District the "Dutch Islands", and Ko Sichang itself "Amsterdam", due to frequent visits by ships of the Dutch East India Company during the 17th century.

[1] American diplomat Edmund Roberts visited the island in the 1830s,[2] describing the area as being occupied by "a few fisherman" who also grew yams, bananas, capsicums, gourds, and cucumbers.

The district consists of a single sub-district (tambon) Tha Thewawong (ท่าเทววงษ์), which is further subdivided into seven villages (mubans).