Numbers 21:16, on the topic of the "Wars of God", after describing the flow of the streams of Arnon toward the borders of Moab says:
וּמִשָּׁם בְּאֵרָה הִוא הַבְּאֵר אֲשֶׁר אָמַר יְהוָה לְמֹשֶׁה אֱסֹף אֶת-הָעָם וְאֶתְּנָה לָהֶם מָיִם
וּמִתַּמָּן אִתְיְהֵיבַת לְהוֹן בֵּירָא הִיא בֵּירָא דַּאֲמַר יְיָ לְמֹשֶׁה כְּנוֹשׁ יָת עַמָּא וְאֶתֵּין לְהוֹן מַיָּא
And from there a well was given to them, it is the well about which God said to Moses 'Gather the nation and I shall give them water'.
Targum Pseudo Jonathan does this as well. As far as I can tell this implies that the well was given to the Israelites from the streams of Arnon.
Two wells are mentioned in the Torah, One was given in Exodus 17, when the Israelites traveled from The wilderness of סין, Sin, and camping in Refidim. The second was given in Numbers 20, when the Israelites traveled to the wilderness of צין, Tzin, and camped there in Kadesh, (the wilderness names are very similar, perhaps suggesting proximity?) Has anyone determined if either of these locations line up with the streams of Arnon?
Based on the Israelites' song about the well and Onkelos' translation thereof, it seems clear that the well was given in the desert, (see verse 18), and then it descended with them into the streams and then ascended with them up to the heights. It seems like 'there' in Onkelos on verse 16 should mean the desert then, but the context of verse 16 doesn't fit at all. Was the well 're-gifted' at the streams?
What does Onkelos mean in verse 16? Where was the well given from?