Numbers 23:1-3, 14, 28

Then Balaam said to Balak, “Build seven altars for me here, and prepare for me here seven bulls and seven rams.” And Balak did just as Balaam had spoken, and Balak and Balaam offered a bull and a ram on each altar. Then Balaam said to Balak, “Stand by your burnt offering, and I will go; perhaps the LORD will come to meet me, and whatever He shows me I will tell you.” So he went to a desolate height.

So he brought him to the field of Zophim, to the top of Pisgah, and built seven altars, and offered a bull and a ram on each altar.

So Balak took Balaam to the top of Peor, that overlooks the wasteland.