Commentary for Numbers 33:11

ויסעו מים סוף ויחנו במדבר סין, “They journeyed from the Sea of Reeds and encamped in the desert of Sin.” The desert mentioned here was not the desert of Sinai seeing the Torah goes on to write in verse 15 that when the people journeyed away from Refidim they encamped in the desert of Sinai.” The desert known as “Sin” is situated between Eylim and Sinai, just as reported in Exodus 16,1