Areas that are naturally at exactly sea-level are always coloured blue regardless, that's why this map of England's fen-land is peppered with blue, even at + 0m: fenland at + 0m.
当然低于海平面的地区总是蓝色，这就是为什么即使是在+0m的时候英格兰的沼泽地也会有零星的蓝点。
Areas that are naturally at exactly sea-level are always coloured blue regardless, that's why this map of England's fen-land is peppered with blue, even at + 0m: fenland at + 0m.
当然低于海平面的地区总是蓝色，这就是为什么即使是在+0m的时候英格兰的沼泽地也会有零星的蓝点。
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