Hanoi is about 12 times bigger than Savannah.

Savannah is approximately 283 sq km, while Hanoi is approximately 3,360 sq km, making Hanoi 1,085% larger than Savannah.
Tip: This to-scale comparison of Savannah vs. Hanoi uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.