David slayed Goliath in the Valley of Elah, in the region of Judah, near the Philistine lines. According to the biblical account, the confrontation occurred at Ephes Dammim in the Elah Valley, between Jerusalem and Ashkelon, where the young shepherd David faced the seasoned Philistine warrior Goliath and defeated him with a sling and a stone, then beheaded him with Goliath’s own sword. This location is traditionally identified as the Valley of Elah, southwest of Jerusalem, in modern-day Israel. If you’d like, I can pull up brief sources or map references to the Valley of Elah and the surrounding geography to corroborate the details.