The dominant physical structure is a wide basin bounded to the north, east and south by mountain ranges.
They passed below a small bridge, where the river opened into a wide basin a quarter of a mile in diameter.
They were entering a wide circular basin at what seemed to be the lowest point in the entire region.
The ford they were to cross was a wide basin where the river spread out over a shale rocky bottom.
It showed six wide, shallow basins that were part of the tiled floor.
Ahead, the road dipped down into a wide, desolate, snow-covered basin.
Ahead was a wide basin filled with soft, powdery stuff.
Below him the slope fell away to a wide grass-covered basin several miles across.
Walden Pond itself, rescued from development in the 1990's, is still very much there, a wide, deep basin of dark water set among trees.
This high land falls to the west into wide basins of agricultural country.
