Refer to 21:19:151:1, 4 & 6 and to 21:18:4:3.

R. Bachye #2 (citing Midrash Tehilim): With reference to 21:19:152:3 (which hints at Yirael not entering Eretz Yisrael) - it hints at the Tzadik (Moshe) who was buried in the valley ¹ - who did not enter Eretz Yisrael.

R. Bachye #3 (citing Kidushin). Refer to 21:18:4:3.

Seforno: The Pasuk implies that, in spite of flowing with them to all of these places, the well lost none of its water along the way - an additional facet of its supernatural qualities.

Rashi #1, Ramban and R. Bachye #1: It means that the well traveled to the top of the cliff ¹ that overlooked Yeshimon (a desplate place from the word 'Shemamah' ² [it was the only river and source of water in the ntire area - Ramban abnd R. Bachye]).

Rashi #2 (citing Midrash Tanchuma): With reference to the well, which was buried (after Moshe died) in the Sea of Teverya (the Kineret), ³ the Pasuk means that, if someone stands on the cliff of Yeshimon ⁴ and looks down into the sea, he will see something that resembles a sieve - which in fact, is the well of Miriam. ⁵

R. Bachye #3 (citing Kidushin). Refer to 21:18:4:3.

Rashbam: Refer to 21:18:4:2.

Targum Yonasan: 'And it (the well) was hidden from them within the borders of Mo'av, that looks down opposite Beis Hayeshimon ⁶ - because they were lax in Torah-study. ⁷

Rashi: Because that is where Moshe died. ¹

Targum Yonasan: Because they were lax in the Mitzvah of Torah-study.

Oznayim la'Torah (in Pasuk 16): Becsuse they now had many streans of water from which to draw.