In the morning, the carpenter found a pair of wooden shoes, just like in his dream, though there
was no trace of wood shavings to be seen. The shoes had the sweet fragrance of oak. Smooth
inside and out, they had sturdy heels and smartly pointed toes. Trying them on, he found the shoes
unsteady on the wooden kitchen floor. But when he stepped outside, the shoes were light, easy to
walk in, and pleasant to his feet. Wandering a bit, he discovered the shoes were ideal for walking
any terrain: in fields, on soft soil, even in the mud. And the wooden shoes kept out water far better
than leather shoes could.
What is the meaning of the word terrain as it is used in the paragraph?