Copper River, Alaska's fourth largest river travels from the dry interior climate to the temperate rainforest along Prince William Sound.

This historic port town is located on the Gulf of Nicoya in Costa Rica. Don't miss the seafood cafes along Paseo de los Turistas promenade.

A lesser-known river port in the Mekong Delta, Sa Dec was once the capital of Dong Thap province of southern Vietnam. Today, it is best known for its flower gardens and authentic bustling market. The city is also famous as the setting for French writer Marguerite Duras' 1984 novel, The Lover, and its 1991 film adaptation of the same name.

If it wasn't for Paris, Ghent would be medieval Europe's largest city. Steeped in history both rebellious and industrious, it sits at the junction of the Leie and Scheldt rivers and was once the site of armed battles by its townsfolk, who raged against heavy taxes and restricted civil liberties.

Marseilles is an enticing port city known for its delectable seafood, breathtaking views of the Mediterranean, and diverse melting pot of cultures.