Sampling localities of Fejevarya limnocharis and simplified map defining regions involved in the study. (a) Sampling localities of the 16 Fejevarya limnocharis populations analyzed in the study. Closed circles (followed by numbers) represent the sampling sites. (1) Pulau Langkawi, (2) Jitra, (3) Lembah Bujang, (4) Sedim, (5) Ulu Paip, (6) Sungai Burung, (7) Sungai Acheh, (8) Bukit Panchor, (9) Kuala Kangsar, (10) Pusing, (11) Langkap (northwest), (12) Sabak Bernam, (13) Tanjong Karang, (14) Kepong, (central west), (15) Kubang Kerian, (16) Besut (east). (b) Simplified map defining regions involved in this study. NW = northwest, CW = central west, E = east.