Sin, Wilderness of (sĭn). A region between Elim and Rephidim. Exodus 16:1; Exodus 17:1; Numbers 33:11-12. Here the Israelites were first fed with manna and quails. The wilderness extends 25 miles along the east shore of the Red Sea, from Wâdy Taiyibeh to Wâdy Feiran; it is now called the plain of el-Markha. It is barren, but has a little vegetation.