The rule of Vietnamese summer: See water, jump in

Beaches in Da Nang are crowed these days. Many families choose to go for a swim in the weekend.

Many look exhausted because of the heat.

Some choose to sit by the water and relax.

Kids are of course the most energetic of all.

How about a flip?

Lifeguards in Da Nang say it has been a very busy week.

It's not much better in Hanoi. In this photo, a man slips down a water slide at West Lake Water Park.

The crowd at Hanoi's West Lake Water Park.

Kids play in the West Lake. Meteorologists forecast that the heat wave in Hanoi lasts until Tuesday.