Beijing, July 12 (Youth.cn) -On July 12th, 2023, Chinese tourists were enjoying boat tours on Heilongjiang River, the border river between China and Russia in Heihe. While many southern cities were experiencing sweltering heat, the average temperature in the city of Heihe, a popular summer resort, was only around 20°C, providing a natural "air-conditioned room." Visitors from other places flocked to the area, enjoying boat tours on the Heilongjiang River and admiring the beautiful scenery on both sides of the China-Russia border.