PALSAR conducted an emergency observation around the river mouth of Irrawaddy on May 6, 2008 just after the hit of Cyclone Nargis. It is possible to estimate changes in flooded areas during one month by comparing between the May 6 and June 6 images. The color composite of these images (Fig.3) shows YELLOW areas spreading around the river mouth of Irrawaddy and north of Myaungmya. Water levels in these areas are expected to lower. On the other hand, some BLUE areas exist, suggesting newly flooded areas probably due to the general rainy cycle.