[Our] authorities say that under the equator there are very high mountains, where there are temperate settlements, made possible by winds, or by the shadow of the mountains, or by the remarkable thickness of the walls, or by underground caves in valleys. At the equator there are also many islands that are truly temperate because of the rivers, or the marshes, or the winds, or for reasons that are unknown to us.

And for a similar reason there are settlements beneath or around the Arctic pole, despite the very intense cold. These settlements are so temperate that people cannot die there: this fact is well known for Ireland. The reasons why this happens are unknown to us. Marco Polo speaks explicitly about this, when he says that there is a certain desert 40 days across where nothing grows, neither wheat nor wine, but the people live by hunting birds and animals, and they ride deers.

When you leave Karakorum and the mount Altai, you go north for 40 days through the plain of Bangu. The people who live there are called Mekrit, and they are subject to Great Khan; their customs are like those of Tartars. They are a very wild people. They feed on the meat of the animals they hunt, especially of deer, of which they have an abundance; actually, they tame the deers and, after taming, ride them. They are lacking in both wheat and wine. In summer, they hunt birds and wild animals in abundance; in winter, they eat cooked animals and birds, and move from those lands because of the excessive cold.

Sundry Particulars on the Plain Beyond Caracoron

And when you leave Caracoron and the Altay, in which they bury the bodies of the Tartar Sovereigns, as I told you, you go north for forty days till you reach a country called the PLAIN OF BARGU. The people there are called MESCRIPT; they are a very wild race, and live by their cattle, the most of which are stags, and these stags, I assure you, they used to ride upon. Their customs are like those of the Tartars, and they are subject to the Great Kaan. They have neither corn nor wine.[They get birds for food, for the country is full of lakes and pools and marshes, which are much frequented by the birds when they are moulting, and when they have quite cast their feathers and can't fly, those people catch them. They also live partly on fish.]