'The Siam's Port') is a district (srok) located in Kampong Cham province, Cambodia.

The administrative center of the district locates not far from the Provincial capital of Kampong Cham in Ampil Leu Village, Ampil Commune about 3 km west from the center of Kampong Cham city on National Highway 7 and is 120 kilometres by road from Phnom Penh.

[2] In February 2007 the United States Peace Corps sent 29 volunteers to live in Kampong Siem District.

[4] During a nine-week stay in the district the group of volunteers from San Francisco studied the Khmer language, acclimatised themselves to the local way of life, tried eating deep fried tarantulas and began teaching English.

Reading from the north clockwise, Kampong Cham shares a border with Stueng Trang district while Krouch Chhmar and Tbong Khmom districts form the eastern boundary.