Sanya, Hainan, China:

Sanya is a tropical coastal city located on the southern tip of Hainan Island, often referred to as the "Hawaii of China." Here are some of its distinctive features:

1. Tropical Climate: Sanya boasts a warm and humid tropical climate, with temperatures rarely dropping below 20°C (68°F) throughout the year. This makes it an ideal destination for beach lovers and those seeking a year-round sunny retreat.

2. Beaches and Resorts: The city is renowned for its beautiful beaches, with soft white sand and clear blue waters. It's a popular destination for both domestic and international tourists, offering a wide range of luxury resorts and hotels.

3. Hainan Hot Springs: Sanya is also famous for its natural hot springs, which are believed to have healing properties. These hot springs are a popular attraction for those looking to relax and rejuvenate.

4. Cultural Landmarks: While Sanya is known for its natural beauty, it also has several cultural landmarks, including the Sanya Tropical Paradise Forest Park and the Nanshan Temple, which offers panoramic views of the city.

5. Diverse Cuisine: The city's culinary scene reflects its diverse population, offering a mix of Chinese, Southeast Asian, and Western dishes.

Harbin, Heilongjiang, China:

Harbin is a city in the northernmost part of China, known for its cold climate and vibrant winter festivals. Here are some of its unique characteristics:

1. Ice and Snow Culture: Harbin is famous for its elaborate ice sculptures and snow sculptures, which are showcased during the Harbin International Ice and Snow Festival. The festival, held annually in January, attracts millions of visitors from around the world.

2. Cold Climate: Harbin experiences some of the coldest temperatures in China, with winter temperatures often dropping below -20°C (-4°F). This extreme cold is a stark contrast to the tropical climate of Sanya.

3. Russian Influence: Harbin has a rich history of Russian influence due to its proximity to Russia. The city has a blend of Russian and Chinese architectural styles, particularly evident in its historic buildings and the Saint Sophia Cathedral.

4. Historical Sites: Harbin is home to several historical sites, including the Zhaohua Park, where you can find the famous "Russian Street," and the Sun Island, which offers a glimpse into the city's Soviet past.

5. Harbin Beer Festival: In addition to the ice and snow festival, Harbin is also known for its annual Harbin Beer Festival, which celebrates the city's love for beer and includes various cultural performances and beer-tasting events.

Both Sanya and Harbin offer unique experiences that reflect the diverse and contrasting climates and cultures of China.