She ran and ran and ran, far, far into the forest.

她跑呀跑呀跑，跑到了森林的深处。

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By the third day they had wandered far into the forest.

到第三天的时候他们已经走到了森林深处。

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We went far into the forest, her father acting as guide.

我们走出森林深处，她的父亲做向导。(表示伴随情况)。

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During the quieter parts of the year (avoid August where increased numbers of tourists scatter the wildlife away from the river, and fruiting season drives the orangutans deep into the forest), you will not need to travel far before you see trees filled with proboscis monkeys.

BBC: Drifting down the Sekonyer