Bertuliai is a village in Šakiai District Municipality, in Marijampolė County, Lithuania. Bertuliai lies at 65 m above sea level. It has 7 inhabitants. The nearest city is Kaunas, 42 km to the east. Among the landmarks around are Ninth Fort (40 km), Panemunė Castle (19.8 km) and Church of the Discovery of the Holy Cross, Ilguva (5.3 km). Among the natural features are Ilguva oak (5.2 km).