The authors discuss the features of transnational criminal activity on the example of one of its varieties in the Siberian Federal District of the Russian Federation to highlight the criminal situation and criminal activity associated with illegal crossing of the Russian Federation state border. For the analysis of the specified criminal activity, sentences of courts of the District were studied and analyzed. The geographical factors influencing implementation of this criminal activity in the constituent entities of the Siberian Federal District, ways of crime concealment, combinatorics of various crimes and offences in the course of implementation of criminal activity, and also its long-term character showing in some cases are considered. Discussion of this issue can contribute to a more effective investigation of the considered category of crimes