The closest beach to Panagia Bay (Sithonia) is Ormos Panagias Beach, just 160 m away. Within 15 km there are 32 beaches; below are the 12 closest to Panagia Bay, ordered by distance. Photos, map, reviews.
160 m from Panagia Bay

830 m from Panagia Bay

920 m from Panagia Bay

1.5 km from Panagia Bay

1.8 km from Panagia Bay

2.4 km from Panagia Bay

4.4 km from Panagia Bay

5.1 km from Panagia Bay

5.3 km from Panagia Bay

5.4 km from Panagia Bay

5.6 km from Panagia Bay

5.7 km from Panagia Bay

Ormos Panagias Beach, just 160 m from Panagia Bay. The rest are listed below, ordered by distance.
Within 15 km of Panagia Bay there are 32 beaches, with 69 across Sithonia in total.
Based on user reviews: Ormos Panagias Beach (★3.8), Trani Ammouda (★3.8), Lagoon Beach (★3.8).
The beaches are spread out around Panagia Bay. A car makes exploring much easier — local buses and taxis are limited outside peak season.
Panagia Bay is on the Sithonia side of Halkidiki, in northern Greece. The nearest airport is Thessaloniki (SKG); from there a car is the most convenient way to reach the Sithonia villages.