Brazilwood, Teak, Mahogany, even the 'aromatic woods' imported from southeast Asia by the Song Dynasty court are all possible candidates for Timber Resources.
But the most important timber resource that left its mark on trade and politics was Ship Timber: specifically, the tall, straight trunks, mostly conifers, required for the masts of major warships and civilian transports in the late 16th to 18th centuries. The British Royal Navy could sequester large stands of oaks in Britain for the hulls and framing, but they had to get the mast timbers from North America (New England specifically) and after the American Revolution, from Scandinavia.
That would make them perfect Treasure/Distant Lands resources for the Exploration Age as soon as anybody tries to build Carracks or Galleons . . .