The term describes a geographic construct, not an actual physical phenomenon, and is of interest mostly to explorers.
Subject to varying definitions, it is of interest mostly to explorers. The term describes a geographic construct, not an actual physical phenomenon.
The term describes a geographic construct, not an actual physical phenomenon. Subject to varying definitions, it is of interest mostly to explorers.
The term describes a geographic construct, not an actual physical phenomenon. Subject to varying definitions, it is of interest mostly to explorers.