Biebrza River in Northeastern Poland53.1N 22.3E
This APM (Alternate Polarization Medium resolution) image shows the Biebrza River in north-eastern Poland, a tributary of the Narew river (near Wizna), with a length of 155 kilometers (28th longest) and the basin area of 7,057 km2 (7,051 in Poland). Today the river is best known for the vivid wildlife in the peatbogs and marshes in its flooding areas.
APM is an ASAR (radar) mode that acquires two signals simultaneously, and is therefore able to generate two grayscale images. The resulting image (visible here) is a combination of those two images, which highlights the similarities and differences between the two.