“…The region‐of‐influence (ROI) technique (Burn, ), which is considered to be superior in several studies (e.g., Institute of Hydrology, ; Gaál et al ., ; Kyselý et al ., ; Das, ) to the other forms of regional analysis (e.g., traditional fixed regional analysis), identifies a region of influence for a target location based on similarity distance measure in the site descriptor space. Climatological descriptors such as average annual rainfall (AAR; Gaál and Kyselý, ), average annual monsoon rainfall (Das, ); and geographical descriptors such as geographical location (Reed et al ., ; Kyselý et al ., ) produced promising results in delineating homogeneous groups. The latter has the advantage of transferring the approach in an ungauged case because geographical coordinates are the only requirement to form groups.…”