  We present the results of a detailed study of the central part of the Seyfert
galaxy Mkn 938. Observational data were obtained with the 6-m telescope of the
Special Astrophysical Observatory of the Russian Academy of Sciences using
integral-field spectrograph MPFS and a scanning Fabry--Perot interferometer.
Mkn 938 is interesting for being a result of a merger of two gas-rich galaxies,
and we observe the final stage of this interaction accompanied with an
extremely powerful burst of star formation and nuclear activity. Our analysis
of the kinematics of gas and stars revealed the presence of gas outflow in the
circumnuclear region Mkn 938 with velocities ranging from -370 to -480 km/s,
and allowed us for the first time to map the high-velocity galactic wind in NaD
absorption line on large spatial scale in this galaxy.
