In the Old Testament period, the Earth was most commonly thought of as a flat disc floating on water.[1] The concept was apparently quite similar to that depicted in a Babylonian world-map from about 600 BCE: a single circular continent bounded by a circular sea,[53] and beyond the sea a number of equally spaced triangles called nagu, "distant regions", apparently islands although possibly mountains.[54] The Old Testament likewise locates islands alongside the Earth; (Psalm 97:1) these are the "ends of the earth" according to Isaiah 41:5, the extreme edge of Job's circular horizon (Job 26:10) where the vault of heaven is supported on mountains.[55] Other OT passages suggest that the sky rests on pillars (Psalm 75:3, 1 Samuel 2:8, Job 9:6), on foundations (Psalms 18:7 and 82:5), or on "supports" (Psalm 104:5),[56] while the Book of Job imagines the cosmos as a vast tent, with the Earth as its floor and the sky as the tent itself; from the edges of the sky God hangs the Earth over "nothing", meaning the vast Ocean, securely supported by being tied to the sky (Job 26:7).[57] If the technical means by which Yahweh keeps the earth from sinking into the chaos-waters are unclear, it is nevertheless clear that he does so by virtue of his personal power.[58]