The distributions of Gekko japonicus (blue dots) and G. swinhonis (pink dots) in South Korea, along with the locations of 14 major international ports (white diamonds). It is to be noted that the gecko populations are generally distributed near international ports or major rivers. The number written next to each population indicates the year of the first observation A the overall distributions of gecko populations in South Korea B recently discovered gecko populations in the north-western part of South Korea. C In the southern part of South Korea, most G. japonicus are distributed near international ports or large rivers. The abbreviated port names are as follows – GI = Gyeongin Port, IC = Incheon Port, PD = Pyeongtaek and Dangin Port, DS = Daesan Port, JH = Janghang Port, GS = Gunsan Port, MP = Mokpo Port, GY = Gwangyang Port, YS = Yeosu Port, MS = Masan Port, BS = Busan Port, US = Ulsan Port, PH = Pohang Port, DM = Donghae and Mukho Port.