Charles Ellicott Commentary 1 Kings 3:4

"And the king went to Gibeon to sacrifice there; for that was the great high place: a thousand burnt-offerings did Solomon offer upon that altar." — 1 Kings 3:4 (ASV)

Gibeon. —The name itself, signifying “belonging to a hill,” indicates its position on the central plateau of Israel, in the land of Benjamin, from where rise several round hills, on one of which the town stood. There was now erected the Tabernacle, with the brazen altar of sacrifice, to which the descendants of the old Gibeonites were attached as hewers of wood and drawers of water (Joshua 9:23). It was therefore naturally “the great high place.”