It is located north of Baaium and south of Dronryp, of which it is a part administratively.

The mainly dispersed residences of the hamlet are located on the roads Longbuorren, Hatzum, Keimptilsterdyk and a part of Rewertdyk (up to the Molensloot).

Built on a terp,[3] the hamlet was first mentioned in 1511 as Hastzen, in 1531 as Hatsem and in 1543 as Hatzum.

On the southeastern side of Baaium was also a place of the same name, which was mentioned in 1511 as Hastzen as well.

It was a large farm that was referred to as Lamkema in the 17th century, later found as a field name as Hatsem.