The G4511 Longnan–Heyuan Expressway (Chinese: 龙南—河源高速公路), commonly referred to as the Longhe Expressway (Chinese: 龙河高速公路), is a 127.87-kilometre-long Chinese expressway (79.45 mi)[1] that connects Longnan County, a county under the administration of the city of Ganzhou in the province of Jiangxi, and Dongyuan County, a county under the administration of the city of Heyuan, in the province of Guangdong.

At its northern end, the expressway begins in Longnan County, Ganzhou, in Jiangxi province, at a future interchange with G45 Daqing–Guangzhou Expressway and an exit to China National Highway 105.

The expressway traverses through mountainous terrain, utilizing numerous tunnels and featuring escape ramps.

In Jiangxi province, the expressway parallels much of China National Highway 105.

Past Heping County, the Beijing–Kowloon Railway curves southeastward toward Longchuan County before curving southwestward, taking a more lengthy route to reach the city centre of Heyuan, while the expressway proceeds directly south toward Heyuan.