After a short course, the Pek reaches the western side of the Homolje mountains and flows in into the river Lipa at the village of Debeli Lug.

Near the confluence of the two rivers is the reservoir of Veliki Zaton (or Valja Fundata), artificial body of water used as a tailing pond for the nearby mines.

It flows straight to the north, following the western side of the Mali Krš mountain, next to the villages of Vlaole, Jasikovo (where it receives the left tributary Jagnjilo/Јагњило) and Leskovo before it meets the Pek.

The Pek continues to the north, curves between the mountains of Homolje and northern Kučaj, next to the villages of Blagojev Kamen and receives the rivers Brodica from the right and Komša and Kisela Voda from the left.

At the village of Rečica, the Pek enters the Kučevska klisura (Cyrillic: Кучевска клисура; Gorge of Kučevo).

Braničevo is the lowest part of the Pek valley, so the river spills in several arms and passes next to many villages (Zelenik, Klenje, Mrčkovac, Miljević, Šuvajić, Donja Kruševica, Tribrode, Braničevo, Kusiće, before it empties into the Danube east of the town of Veliko Gradište.

The river's course is characterized by many elbow turns, similar to the Danube's on this same section (most notably, the Đerdap), but on a much lesser scale.

[4] The exploitation was continued in medieval Serbia,[3] but the extraction stopped during the Ottoman period, to be restored in the late 19th century.

[5] Austro-Hungarian naturalist and traveller Felix Kanitz who visited the Pek area in 1858, wrote that the old name of the town of Kučevo was "Chrisovehia" (meaning "Old Gold[en Land]", in Serbian "Starozlatija").

[6] During the Interbellum, an excavator owned by the royal Karađorđević dynasty was dredging the river at Neresnica in search of gold.

Unofficial reports from April 2021 showed that the company stopped discharging wastewater from the Jama mine in Majdanpek, which was considered the main pollutant, with intention to solve the problem.

[9] This prompted "Zijin" to issue a statement that the inspection only ordered halting of the construction of the new ventilation shafts, and that mine is not shut down.