Over-extraction of ground water has caused new flooding problems for the city as it sinks below the historic lake floor.

Some hydrothermal activity remains along the lake floor.

The females will scoop out a small hole or depression in the lake floor and will lay anywhere from 2000 to 6000 eggs.

She could see the lake floor clearly now; a crumpled, grey landscape fading slowly away into the gloom.

The steps ended on the dark ash of the lake floor.

Other springs discharge directly from the lake floor.

The lake floor is lined with mercury, and the bottom third of the lake is without oxygen.

As he lumbered toward her, the lake floor dropped away suddenly.

Varzil strained to make out the shape, vast and murky, on the lake floor.