New Zealand is about 1.8 times smaller than Turkmenistan.

Turkmenistan is approximately 488,100 sq km, while New Zealand is approximately 268,838 sq km, making New Zealand 55.08% the size of Turkmenistan. Meanwhile, the population of Turkmenistan is ~7.6 million people (2.3 million fewer people live in New Zealand).
Tip: This to-scale comparison of Turkmenistan vs. New Zealand uses the Mercator projection, which distorts the size of regions near the poles.
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