Archaeologists studying the layout of Balhae's cities have concluded that they shared features common with cities in Goguryeo, indicating that Balhae had retained cultural similarities with Goguryeo.
Arkæologer studerer byplanerne for Balhae byer har konkluderet, at Balhae byer delte fælles træk med byer i Goguryeo, hvilket indikerer, at Balhae bevarede kulturelle lighedstræk med Goguryeo efter sin grundlæggelse.