The Bible is primarily a book of history, and without some knowledge of its historical contents no one can rightly understand its revelation of divine truth. But in order to know the history contained in the Old Testament we must obtain a view of the lands in which that history was wrought. We therefore study first of all the =Old Testament World=. I. =Location and Extent.= The history of the Old Testament was enacted upon a field less than half the area of the United States. It extended from the river Nile to the lands east of the Per'sian Gulf and from the northern part of the Red Sea to the southern part of the Cas'pi-an. The world of Old Testament history was thus 1,400 miles long from east to west and 900 miles wide from north to south, and it aggregated 1,110,000 square miles, exclusive of large bodies of water. II. Let us begin the construction of the map by drawing upon its borders =Six Seas=, four of which are named in the Old Testament. 1. The =Cas'pi-an Sea=, of which only the southern portion appears in the northeastern corner of our map. 2. The =Per'sian Gulf=, south of the Cas'pi-an, on the southeast. 3. The =Red Sea=, on the southwest (Exod. 15. 4; Num. 33. 10; 1 Kings 9. 26). 4. The =Med-i-ter-ra'ne-an Sea=, on the central west. Note its names in Josh. 1. 4 and Deut. 34. 2. 5. The =Dead Sea=, north of the eastern arm of the Red Sea (Gen. 14. 3; Deut. 4. 49; Joel 2. 20; Ezek. 47. 18). 6. =Lake Chin'ne-reth= (ch pronounced as k), the name in the Old Testament for the Sea of Gal'i-lee (Num. 34. 11; Josh. 13. 27). III. Next we indicate the =Mountain Ranges=, most of which, though important as boundaries, are not named in the Bible. 1. We find the nucleus of the mountain system in =Mount Ar'a-rat=, a range in the central north (Gen. 8. 4). From this great range three great rivers rise and four mountain chains branch forth. 2. The =Cas'pi-an Range= extends from Ar'a-rat eastward around the southern shore of the Cas'pi-an Sea. [Illustration: MAP OF THE OLD TESTAMENT WORLD.] 3. The =Za'gros Range= extends from Ar'a-rat southeasterly to the Per'sian Gulf, which it follows on the eastern border. 4. The =Leb'a-non Range= extends from Ar'a-rat in a southwesterly direction toward the Red Sea. Mount Her'mon, the mountain region of Pal'es-tine, Mount Se'ir, on the south of the Dead Sea, and even Mount Si'nai, all belong to this chain (Deut. 3. 25; Josh. 13. 5; 1 Kings 5. 6). 5. The =Tau'rus Range=, from Ar'a-rat westward, following the northern shore of the Med-i-ter-ra'ne-an. IV. The =Rivers=, for the most part, follow the lines of the mountain ranges. 1. The =A-rax'es=, from Ar'a-rat eastward into the Cas'pi-an Sea, may be taken as the northern boundary of the Old Testament world. 2. The =Ti'gris=, called in the Bible _Hid'de-kel_, flows from Ar'a-rat, on the southwestern slope of the Za'gros mountains, in a southeasterly direction into the Per'sian Gulf (Gen. 2. 14; Dan. 10. 4).