We set off in a southerly direction.

我们向南方出发了。

《柯林斯英汉双解大词典》

Because of the barrier of ice to the east, the Pacific Ocean to the west, and populated areas to the north, there may have been a greater impetus for people to move in a southerly direction.

因为东面有冰的屏障，西面是太平洋，而且北面是人口稠密的地区，所以促使人们向南迁移的动力会更大。

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Minutes later, we cast off and headed offshore in a southerly direction.

几分钟以后，我们启航向南驶去。

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