English: Satellite image of Japan in April 2018. On April 21, 2018, the Moderate Resolution Imaging Spectroradiometer (MODIS) on board NASA’s Terra satellite acquired a true-color image of southern Japan. The four main islands seen in this image are, from north to south: Hokkaido, Honshu, Shikoku, and Kyushu. To the west, across the Sea of Japan, eastern South Korea can be seen while to the northwest parts of North Korea, China, and eastern Russia are visible. Numerous red hot spots are scattered across the image, particularly near Ise Bay on Honshu and in eastern Russia. Each red hot spot is an area where the thermal bands on the MODIS instruments detected areas where the temperature is substantial higher than background.