What altitude is required for IFR operations in mountainous areas?

In mountainous areas, the requirement for IFR operations is to maintain an altitude that provides adequate clearance above the highest obstacle in the vicinity. Specifically, you must fly at least 2,000 feet above the highest obstacle within a horizontal distance of 4 nautical miles from the course to ensure safe navigation and avoid potential terrain conflicts. This safety margin is crucial in mountainous terrain where obstacles can be significantly higher and more variable, increasing the risk of collisions with those obstructions.

By adhering to this altitude requirement, pilots can ensure they have enough vertical separation from high terrain, allowing for a safer flight path, even in conditions of low visibility. This principle is an important aspect of IFR operations, particularly in areas where terrain can present challenges to navigation and safety.