Naha is the capital of Okinawa Prefecture, the tropical island group south of mainland Japan. The modern city was officially founded on May 20, 1921. Before that Naha had been for centuries one of the most important and populous sites in Okinawa. In the medieval and early modern periods, it was the commercial center of the Ryūkyū Kingdom.

Vancouver is a coastal city located in the Lower Mainland of British Columbia, Canada. It is one of the most ethnically and linguistically diverse cities in Canada; 52% of its residents have a first language other than English. Classed as a Beta global city, the city is well known for its majestic natural beauty, as it is nestled between the Coast Mountains and the Pacific Ocean. It is frequently ranked as one of the "best cities to live in" and is certainly a beautiful destination to visit.

Seoul, officially the Seoul Special City, is the capital and largest city of South Korea. A megacity with a population of over 10 million, it is one of the largest cities in the world. The Seoul National Capital Area is the world's second largest metropolitan area with over 24.5 million inhabitants, which includes the Incheon metropolis and most of Gyeonggi province. Almost half of South Korea's population live in the Seoul National Capital Area, and nearly a quarter in Seoul itself, making it the country's foremost economic, political, and cultural center.

Ketchikan is an Alaskan city facing the Inside Passage, a popular cruise route along the state's southeastern coast. The city is named after Ketchikan Creek, which flows through the town, emptying into the Tongass Narrows a short distance southeast of its downtown. Civic boosters have dubbed the community the "Salmon Capital of the World". The Misty Fiords National Monument is one of the area's major attractions, and the Tongass National Forest has long been headquartered in Ketchikan, mostly in the city's historic Federal Building.

Yokohama is the second largest city in Japan by population, and most populous municipality of Japan. It is the capital city of Kanagawa Prefecture. It lies on Tokyo Bay, south of Tokyo, in the Kantō region of the main island of Honshu. It is a major commercial hub of the Greater Tokyo Area. It’s also known for Sankei-en Garden, a botanical park containing preserved Japanese residences from different eras, and the seaside Minato Mirai district, site of the 296m Landmark Tower.   Yokohama's population of 3.7 million makes it Japan's largest city after the Special Wards of Tokyo. Yokohama developed rapidly as Japan's prominent port city following the end of Japan's relative isolation in the mid-19th century, and is today one of its major ports along with Kobe, Osaka, Nagoya, Hakata, Tokyo, and Chiba.