Moorland is wild, open country, usually up in the hills, covered with rough grass, heather, and low bushes, and almost no trees. You walk and the wind hits you; the ground can be springy or a bit wet, but it is not a swamp and it is not a farm. Britain has a lot of it — the Yorkshire moors, Dartmoor, bits of Scotland — and when British people say they are going on the moors, this is the picture: empty, a little lonely, sheep maybe, but not a park. People use moor and moorland for the same kind of place; moorland just makes it clear you mean the stretch of land itself. Though actually, a heath is a cousin of this idea, often a bit drier and lower, and a bog is wetter than you want to walk. It is a landscape word, not a thing you can pick up.