Exodus 15:27

Elim : a place (an oasis)
(29° 18´, 32° 58´)

Exodus 17:1

Israel : a citizen of Israel.,a member of the nation of Israel

Rephidim : an encampment where water came out of a rock for Israel
(28° 43´, 33° 50´)

Sin : a wilderness region between Elim and Mt. Sinai (IBD)
(28° 50´, 33° 25´); (28° 50´, 33° 25´); (30° 41´, 34° 29´); (30° 41´, 34° 29´)