Abstract:Based on Emergency Events Database (EM-DAT) and Dartmouth Flood Observatory disaster datasets, this study compares the variation characteristics of frequency, magnitude and fatalities of floods in South Asia and Southeast Asia during 1985-2019. The trends of tropical cyclone (TC)-associated floods are also discussed. The results show that frequency of floods in Southeast Asia is about 15% more than that in South Asia for recent 35 years. Among all floods, the frequency of TC-associated floods in Southeast Asia is around 4 times more than that in South Asia. The TC-associated floods account for test of averaged floods by two databases indicates that both floods in South Asia and Southeast Asia have significantly increased in occurrence frequency over recent 35 years but the flood-induced fatalities per flood event have decreased significantly. On average, the magnitude of floods in Southeast Asia is smaller than that in South Asia, but there is a significant increasing trend in the magnitude of floods in Southeast Asia during recent 35 years. In addition, both economic losses of floods in South Asia and Southeast Asia based on EM-DAT data exhibit obvious increasing trend over the past 35 years. approximately 20% of all floods in Southeast Asia. Monthly distribution shows that floods in South Asia concentrate in June-August, exhibiting a unimodal pattern while TC-associated floods in South Asia present a bimodal distribution. Floods in Southeast Asia are evenly distributed throughout the year. The trend