History of Phoenicia by George Rawlinson
Hence the trade with the Cassiterides was constant
If the Phoenicians visited, as some maintain that they did, the coasts of the Baltic, it must have been for the purpose of obtaining amber. Amber is thrown up largely by the waters of that land-locked sea, and at present especially abounds on the shore in the vicinity of Dantzic. It is very scarce elsewhere. The Phoenicians seem to have made use of amber in their necklaces from a very early date; and, though they might no doubt have obtained it by land-carriage across Europe to the head of the Adriatic, yet their enterprise and their commercial spirit were such as would not improbably have led them to seek to open a direct communication with the amber-producing region, so soon as they knew where it was situated. The dangers of the German Ocean are certainly not greater than those of the Atlantic; and if the Phoenicians had sufficient skill in navigation to reach Britain and the Fortunate Islands, they could have found no very serious difficulty in penetrating to the Baltic. On the other hand, there is no direct evidence of their having penetrated so far, and perhaps the Adriatic trade may have supplied them with as much amber as they needed.
The trade of the Phoenicians with the west coast of Africa had for its principal objects the procuring of ivory, of elephant, lion, leopard, and deer-skins, and probably of gold. Scylax relates that there was an established trade in his day (about B.C. 350) between Phoenicia and an island which he calls Cerne, probably Arguin, off the West African coast. "The merchants," he says, "who are Phoenicians, when they have arrived at Cerne, anchor their vessels there, and after having pitched their tents upon the shore, proceed to unload their cargo, and to convey it in smaller boats to the mainland. The dealers with whom they trade are Ethiopians; and these dealers sell to the Phoenicians skins of deer, lions, panthers, and domestic animals--elephants' skins also, and their teeth. The Ethiopians wear embroidered garments, and use ivory cups as drinking vessels; their women adorn themselves with ivory bracelets; and their horses also are adorned with ivory. The Phoenicians convey to them ointment, elaborate vessels from Egypt, castrated swine(?), and Attic pottery and cups. These last they commonly purchase [in Athens] at the Feast of Cups. These Ethiopians are eaters of flesh and drinkers of milk; they make also much wine from the vine; and the Phoenicians, too, supply some wine to them. They have a considerable city, to which the Phoenicians sail up." The river on which the city stood was probably the Senegal.