Forest of Qohor

The Forest of Qohor is an extremely large area of woodland and forest on the eastern continent of Essos. It borders the Free Cities region to the east and the Dothraki sea to the north-west. The Shivering Sea lies to the north.

The Free City of Qohor is located on the forest's western edge. Despite its sheer size, the forest presents no significant obstacle to Dothraki khalasars, which can pass through the forest with impunity.

Season 1
The khalasar of Khal Drogo passes through the Forest of Qohor on its way from Pentos to Vaes Dothrak. Based on comments by Ser Jorah Mormont, it is possible that the immensely tall forest of reeds that Daenerys Targaryen orders the khalasar to halt in may be part of the Forest of Qohor.

In the books
In the Song of Ice and Fire novels, the Forest of Qohor is traversed