Hashimoto's Thyroiditis. Also called Hashimoto's disease, Hashimoto's thyroiditis is an autoimmune disease, a disorder in which the immune system turns against the body's own tissues. In people with Hashimoto's, the immune system attacks the thyroid.
According to the U.S. Census Bureau, the county has a total area of 4,751 square miles (12,310 km 2), of which 4,058 square miles (10,510 km 2) is land and 693 square miles (1,790 km 2) (15%) is water.
We did a quick calculation and figured out that the map isn't so far off. We took a look at this list on Wikipedia that tallies the land mass within city limits and added all the numbers up. Altogether these cities (plus Manhattan) take up about 469 square miles. The city of Los Angeles itself is about 469 square miles. There's some rounding in there, so the numbers might not be so exact, but it looks pretty close through our quick back-of-the-envelope calculation. There are a few problems.