为什么纳尼亚王国地图和原著中描写的不同？

关于《纳尼亚传奇：狮子、女巫和魔衣橱》原著和地图不同的疑问第一个问题：
地图上石桌在白女巫城堡的东南方，而书里写白女巫向西找过河的地方。
带上你手下跑得最快的狼，立刻到海狸家去。”女巫说，“不管你在那里发现谁，全都给我杀了。如果他们已经走了，那就全速赶去石桌，但是不要被人看见。在那里躲好等我。这期间我得向西走好几英里才能找到雪橇过河的地方。你大概能在那些人类抵达石桌之前追上他们。你也知道发现他们之后该怎么做！”
Take with you the swiftest of your wolves and go at once to the house of the Beavers,” said the Witch, “and kill whatever you find there. If they are already gone, then make all speed to the Stone Table, but do not be seen. Wait for me there in hiding. I meanwhile must go many miles to the West before I find a place where I can drive across the river. You may overtake these humans before they reach the Stone Table. You will know what to do if you find them!”第二个问题：