Tanzania is about 15 times bigger than West Virginia.

West Virginia is approximately 62,361 sq km, while Tanzania is approximately 947,300 sq km, making Tanzania 1,419% larger than West Virginia. Meanwhile, the population of West Virginia is ~1.9 million people (62.0 million more people live in Tanzania).
Tip: This to-scale comparison of West Virginia vs. Tanzania uses the Mercator projection, which distorts the size of regions near the poles.