A thousand miles from the North Pole, and heading south. 这是距离北极点以南1000英里的地方

5. are the most extensive forests on Earth.
   在地球上分布最为广泛
6. Their sheer extent stuns the imagination.
   它们的分布之广,超出想象
7. The barren snows of the Arctic.
   冰雪覆盖的北极地区
8. A thousand miles from the North Pole, and heading south.
   这是距离北极点以南1000英里的地方
9. This is the very first place that trees can grow.
   这也是树木长到的最北处
10. To begin with the conifers are sparse
    一开始松树比较稀疏
11. but soon they dominate the land.
    再往南它们便马上支配了这片土地

来自《行星地球 第一季 第十集 Planet Earth S01E10 季节森林》第 8 行