Other than the Nile, Tigris and Euphrates, navigable rivers during the Islamic areas were being unusual, so transport by sea was essential. Islamic geography and navigational sciences ended up very formulated, using a magnetic compass as well as a rudimentary instrument often known as a kamal, used for celestial navigation https://folkmusictradition39493.blue-blogs.com/40447788/the-ultimate-guide-to-maritime-history