travel advisory
Official government notice urging citizens to avoid non-essential travel to a specific country or region, often due to safety concerns.
The Ministry of Foreign Affairs issued a travel advisory for that country.
A stronger warning than 渡航自粛勧告, urging citizens to cancel or postpone all travel, not just to refrain voluntarily.
Advisory to evacuate or leave an area, whereas 渡航自粛勧告 advises against traveling to a place.
Compound of 渡航 (travel abroad), 自粛 (self-restraint), and 勧告 (advisory).