Records of marbled crayfish (black filled circles marked with numbers) in the West-Balaton region (Hungary). (1): Lake Hévíz; (2) and (3): Északi-árapasztó-csatorna; (4): Páhoki-övcsatorna; (5)–(7): Egyesített-övcsatorna. The large map represents the described study area in the West-Balaton region whose geographic position within Hungary is shown as a rectangle on the smaller map (bottom right). The small map (top left) is an enlarged section of thermal Lake Hévíz whose position on the large map is indicated by the black arrow. The geometric shapes within the lake represent the outlines of the bathing buildings, and the dashed concentric lines are the depths contours of the water.