The study examines the results of complex geophysical research of threearchaeological sites located near the southern part of the Black Sea coastline in Bulgaria:Propadnalata Voda, Atiya, and Alepu. The authors discuss the use of complex geophysical methodsin archaeology depending on the objectives of archaeological research, on the one hand, and thelikely properties of the archaeological sites, on the other. As known, the methods of appliedgeophysics involve reverse geophysical problems, which do not have definitive solutions. Toovercome potential ambiguities in this regard, the study demonstrates how the complementary useof different methods makes the interpretation of the final results easier.