Abstract: A sensor network (1) as well as a method for monitoring a terrain (6) is specified. The sensor network (1) has a number of fixed-position sensors (3, 3?, 3?), which can be deployed in the terrain (6), and at least one programming module (25), with the fixed-position sensors (3, 3?, 3?) each being equipped with a communication device, with the at least one programming module having a position-finding device and a programming device (25), in which case the position of the sensors (3, 3?, 3?) can be determined by the position-finding device and can in each case be applied to the sensors (3, 3?, 3?) by the programming device (25) via the communication device, and with the sensors (3, 3?, 3?) being designed such that they themselves form a network. The sensor network (1) as well as the method, which is carried out in a manner corresponding to it, for monitoring the terrain (6) require sensors (3, 3?, 3?) of simple design, and are thus associated with a cost advantage.