Guyana is around the same size as Nebraska.

Nebraska is approximately 199,099 sq km, while Guyana is approximately 214,969 sq km, making Guyana 8% larger than Nebraska. Meanwhile, the population of Nebraska is ~1.8 million people (1.0 million fewer people live in Guyana).
Tip: This to-scale comparison of Nebraska vs. Guyana uses the Mercator projection, which distorts the size of regions near the poles.