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.