Willow catkins waft through the air at the Irtysh River, Northwest China’s Xinjiang Uygur Autonomous Region. The light from the setting sun creates a beautiful May scene. (Photo: China News Service/Chen Yang)

Willow catkins waft through the air at the Irtysh River, Northwest China’s Xinjiang Uygur Autonomous Region. The light from the setting sun creates a beautiful May scene. (Photo: China News Service/Chen Yang)

Willow catkins waft through the air at the Irtysh River, Northwest China’s Xinjiang Uygur Autonomous Region. The light from the setting sun creates a beautiful May scene. (Photo: China News Service/Chen Yang)

Willow catkins waft through the air at the Irtysh River, Northwest China’s Xinjiang Uygur Autonomous Region. The light from the setting sun creates a beautiful May scene. (Photo: China News Service/Chen Yang)

Willow catkins waft through the air at the Irtysh River, Northwest China’s Xinjiang Uygur Autonomous Region. The light from the setting sun creates a beautiful May scene. (Photo: China News Service/Chen Yang)

Willow catkins waft through the air at the Irtysh River, Northwest China’s Xinjiang Uygur Autonomous Region. The light from the setting sun creates a beautiful May scene. (Photo: China News Service/Chen Yang)