Mal de debarquement, or “land sickness,” is a transient sensation of tumbling, swinging, unsteadiness, and disequilibrium reported by passengers and crew after returning to land from long sea voyages. Although mal de debarquement is mentioned in classic texts on seasickness,’ 2 there are no specific studies concerning the nature and extent of this phenomenon. A computer search of the literature yielded only one publication dealing with persistent (not transient) mal de debarquement.3 We report a survey of the incidence of mal de debarquement and its relation to experience at sea and susceptibility to seasickness.