The Hoan Kiem lake is one of the most famous icon of Hanoi, it is situated strategically in the center of old quarter, so a visit to this lake certainly is highly recommended if you're visiting the area.
The lake itself may not have any significant attraction, beside a temple built to respect the turtles living in here; but even an 15 minutes walk would is sufficient to give a glance of how Hanoian enjoy their tranquil time by the lake.
If you're lucky enough, you will be able to see the giant turtle living in this lake. If you come on the early of summer, the vegetation as at its best, blooming with flower.
To circle the lake you might need about 15-20 minutes running, or up to 40 minutes walking and sitting.
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