Towering above the lush lowland and the rise of heather moorland is a camel-backed basalt ridge with a Sphinx-like protrusion known as the Sgurr of Eigg.

The basalt ridges are the product of several massive lava flows hundreds of feet deep that welled up in faults created by the rifting apart of North America from Eurasia and Africa.

The association gradually bought 20 parcels of land that included everything from primitive cabins to two-story summer cottages, perched along the humped basalt ridges.

This basalt ridge is the product of several massive lava flows hundreds of feet deep that welled up in faults created by the rifting apart of North America from Eurasia and Africa over a period of 20 million years.

To either side, the ground had cracked open millennia before and oozed lava into parallel basalt ridges a kilometer apart.

They left behind one of the region's largest collections of petroglyphic art, about 22,000 glyphs along a single basalt ridge.

They rise above the rest of the state - a continuous series of parallel basalt ridges, which at one time were lava.

Collinson noted the islands to be a basalt ridge running south/southeast.

Elsewhere reared worn yellow cliffs, black basalt ridges, ocherous dunes, on and on beneath a sky almost purple.

Prominent basalt ridges, mountains, buttes, canyons, and other landscape features include: