A small river has become a flashpoint in a broader regional conflict: The course of the 145-kilometer (90-mile) Litani River in Lebanon mirrors the front lines of the conflict between Hezbollah and Israel. The Litani River also highlights the current fragility of international law. Despite the growing escalation in Lebanon between Israel and Hezbollah , the mandate of the long-standing UN mission UNIFIL — which has stationed international peacekeeping forces in the border region since 1978 — is set to expire at the end of the year. Israeli evacuation orders In Lebanon, the Iran-backed Hezbollah is fighting against the Israeli army amid the US-Israel war with Iran. Hezbollah is designated as a terrorist organization by the United States, Germany, and other countries. Hezbollah had fired numerous drones and rockets at Israel in early March. According to the militia’s official statement, the airstrikes were intended as retaliation for the killing of Iran's Supreme Leader Ali Khamenei.…