The coast of Pictland, some 1300 miles long, had not a single port city. It is the domain of the Sea-Land Picts, who have small villages and are on a lower cultural level than their inland brethren. They did not go to sea, but apparently scavenged the strand for walrus and whale carcasses, which yielded ivory that could be traded.
Interior Pictland is described as a "howling wilderness". It is presumed to be a slowly rising coastal plain, a vast marine forest with mild winters, broadleaf to the south, mixed with conifers to the north -- humid, rank, and tangled with briars, thick, shrubby undergrowth, ivy, and other vines.
The saber-tooth tiger and other large carnivores such as panthers, venomous pythons, wolves, cave-bears, and dragons make life interesting for the forest-dwelling Picts. The woodland glades are the home of elephants, antelopes, and deer, including the giant elk. The abundance of fur-bearers encourages the Picts (who go more or less naked) to hunt pelts and trade them to the civilized people in the East.
Although Pictland is called a wilderness by the Hyborians, it seems to have been a virtual paradise to the hunting-and-gathering Picts.
References: Hyborian Age I-II, Treasure of Tranicos, Beyond the Black River, Wolves Beyond the Border, Conan at the Demon's Gate.