In both of the main Lord of the Rings wikias, it is stated that Númenor was raised by the Valar;
Númenor (Q: "westland", pron. [ˈnuːmenor]) or Númenórë (pron. [ˌnuːmeˈnoːre]), known in the Common Speech as Westernesse and in Adûnaic as Anadûnê, was one of the names of the isle of Elenna, which was raised from the Great Sea by the Valar in the beginning of the Second Age.
-From Tolkien Gateway
Númenor was a great island brought up out of the sea by the Valar for the Edain to dwell in, in the early Second Age after the final ruin of Beleriand, and was where the Númenoreans originated from.
From Lord of the Rings Fandom wikia
I mean, Númenor was in the sea, and the 2 Ainur associated with the sea are Ulmo and Ossë. I can't imagine Tulkas swimming down to the bottom of the ocean to lift Númenor up.
So, who does Valar refer to? Is it stated in any of Tolkien's writing if it was Ulmo, Lord of Waters; or his Maiar Ossë, who raised Númenor?