The Ishikari River is located in Hokkaido, and is 268 kilometers (167 miles) in length. It orginates in Mount Ishikari of the Kitami Mountains, and flows through Asahikawa and Sapporo. It eventually terminates in the Sea of Japan.
Definition of Greek fire. : an incendiary composition used in warfare by the Byzantine Greeks that is said to have burst into flame on wetting.
Fire is a conversion of chemical energy into thermal and electromagnetic energy via a chemical reaction that combines the molecules in fuel (wood, say) with oxygen from the air to create water and carbon dioxide. It releases energy in the form of heat and light.