Hai Phong, Vietnam

Living in Vietnam's major northern port city means dealing with intense humidity and a steady stream of cargo ships. The metro area houses 2.12 million people in a sprawling industrial hub that's rapidly modernizing while maintaining its strategic maritime importance. The brutal summer heat, with temperatures regularly hitting 91°F (33°C) and 90% humidity, is a major quality-of-life challenge for expats.

This is a workman's city focused on shipping, manufacturing and trade. The port handles most of Vietnam's northern cargo traffic while factories churn out everything from textiles to ships. Despite being Vietnam's third-largest city, it lacks the international amenities of Hanoi or Ho Chi Minh City. The upside is significantly lower living costs than those major metros, plus easy access to both the capital and scenic Ha Long Bay. The local economy is growing steadily thanks to increased foreign investment, particularly from Chinese infrastructure projects.