Easton Bible Dictionary on Mt. Horeb
<p>Desert or mountain of the dried-up ground, a general name for the whole mountain range of which Sinai was one of the summits (<a href="http://www.crossbooks.com/verse.asp?ref=Ex+3%3A1">Ex 3:1</a>; <a href="http://www.crossbooks.com/verse.asp?ref=Ex+17%3A6">Ex 17:6</a>; <a href="http://www.crossbooks.com/verse.asp?ref=Ex+33%3A6">Ex 33:6</a>; <a href="http://www.crossbooks.com/verse.asp?ref=Ps+106%3A19">Ps 106:19</a>). The modern name of the whole range is Jebel Musa. It is a huge mountain block, about 2 miles long by about 1 in breadth, with a very spacious plain at its north-east end, called the Er Rahah, in which the Israelites encamped for nearly a whole year.
Easton Illustrated Bible Dictionary: And Treasury of Biblical History, Biography, Geography, Doctrine, and Literature.</p>