The Pescara Circuit was a 16.032 mi race course made up entirely of public roads near Pescara, Italy that hosted the Coppa Acerbo auto race. Pescara is the longest circuit to ever host a Formula One Grand Prix.The country and town roads used were both narrow and bumpy. Like many long circuits, Pescara was revered as a fantastic driver's circuit, but also like Spa and the Nürburgring, it was extremely dangerous and unforgiving.
The long track travelled through a number of villages situated on hills surrounding Pescara, following a roughly triangular shape with its corners at the seaside municipality of Pescara. It included two 3.4 mi long straights between the seaside municipality of Montesilvano, nicknamed "The Flying Kilometre".
Wikipedia https://en.wikipedia.org/wiki/Pescara_Circuit
Address 26 Contrada Valle Cupa, Trave 65015, Italy
Coordinates 42°28'30" N 14°9'2.999" E