Passage: This order is closely related to the Salmoniformes, the two comprising the superorder Protacanthopterygii, and are often included in their order.  The esociform fishes first appeared in the mid-Cretaceous — early products of the Euteleost radiation of that time.  Today, they are found only in fresh water in North America and the northern Eurasian regions.

Question: Where are they only found today?
fresh water in North America and the northern Eurasian regions