While the exact location of the first discovery of lodestone (magnetic rock) is unknown, it's widely believed to have been in ancient Greece, specifically in the region of Magnesia, located in the northeastern part of the country.

Here's why:

* The name "lodestone" itself is derived from the Greek word "magnes" (μαγνῆτις), which refers to the region of Magnesia. This suggests the region was known for its magnetic rocks.

* Ancient Greek philosophers and writers, including Pliny the Elder, discussed the properties of lodestone. Pliny even mentions that the stone was first discovered in Magnesia.

However, it's important to note that no archaeological evidence definitively confirms the exact location of the first discovery. The legend of the discovery in Magnesia has been passed down through history and is widely accepted, but the exact location remains uncertain.