Aloy can use a quick travel system that enables her to instantly teleport to every campfire she discovers (its icon on the world map must be green). However, the system has one serious limitation - a jump to selected area consumes the fast travel packs. You can use all of them very quickly. The packs can be bought from the merchants or created on your own. The latter action consumes 15 pieces of Ridge-wood, 1 Fatty Meat and 1 Bony Meat.
Once you reach Meridian in the western part of the world, you should quickly visit one of the common merchants (you will find him in the marketplace in the upper part of the city) and buy a Golden Fast Travel Pack for a rather small price. Obtaining this rare item completely eliminates the necessity of having the regular fast travel packs. Of course, you can still buy/craft them if you want. From now on you can jump between the fires without any limits.