The Duli Mountain-Dalongding Trail is also called Hongnankeng Forest Ancient Trail. It begins at Fengtian Rock in Hongnankeng (874m above sea level) and ends near the Dalongding Private Guesthouse at the summit of Dalongding Mountain. The 1,550m trail passes by a betel nut plantation and a moso bamboo forest. A one-way trip takes about an hour. It is the longest among the ancient trails on Duli Mountain, but visitors will definitely think it is worth it when they stand at the summit and see the endless tea plantations and excellent unhindered views.