Gojeongri dinosaur's egg fossil area, Dinosaur egg fossil site in Hwaseong, South Korea.

Gojeongri dinosaur egg fossil site lies in Goseong-ri, Songsan-myeon, Hwaseong, on Cretaceous sediment dated to roughly 85–83 million years ago. Eggs and nests were found at six or seven spots that were islands before the Sihwa Lake tidal flats were created. About 20 nests, 50–60 cm across, held 5–6 eggs each, up to 12; the oval eggs measure 11–14 cm and some 180 have been found.

The egg fossils were found at six or seven spots that were islands before the Sihwa Lake tidal flats were created, in sedimentary layers of the Cretaceous period estimated at 85–83 million years old. South Korea designated the site Natural Monument No. 414 on 21 March 2000.

The site reveals evidence of dinosaur life from millions of years ago when these creatures inhabited the region and reproduced here. Visitors can observe how the eggs were naturally buried in rock layers, offering a tangible connection to prehistoric times.

Dedicated pathways allow visitors to safely observe the excavation zones, with information boards placed throughout the area. Plan to visit during dry weather so you can walk comfortably across the site without difficulty.

The site lies in the tidal flats of Sihwa Lake, and the fossil-bearing layers were once six or seven separate islets before the lake's flats formed. About 180 eggs have been counted so far, and researchers expect more under the mud that still covers part of the layers.