![](https://static.wixstatic.com/media/2d1f59_608244cf286147bfb3f65175f8c34a01~mv2.jpg/v1/fill/w_70,h_45,al_c,q_80,usm_0.66_1.00_0.01,blur_2,enc_auto/2d1f59_608244cf286147bfb3f65175f8c34a01~mv2.jpg)
The world’s longest mountain range is not fully visible because it’s actually the subterranean Mid-Ocean Ridge, which lies mostly under the ocean and extends for about 40,000 miles.
![](https://static.wixstatic.com/media/2d1f59_7ccadfa855b345eba0726a5d2dc5e098~mv2.jpg/v1/fill/w_54,h_59,al_c,q_80,usm_0.66_1.00_0.01,blur_2,enc_auto/2d1f59_7ccadfa855b345eba0726a5d2dc5e098~mv2.jpg)
It runs along the north-south axis of the Atlantic Ocean and stretches from the Arctic Ocean to near the southern tip of Africa.
![](https://static.wixstatic.com/media/2d1f59_d8542461e1294d0f8f4b37ac2d3e8416~mv2.jpg/v1/fill/w_65,h_49,al_c,q_80,usm_0.66_1.00_0.01,blur_2,enc_auto/2d1f59_d8542461e1294d0f8f4b37ac2d3e8416~mv2.jpg)