Beleriander is bordered by the sea to the west and gradually narrows in width from north to south. There are three rivers along the western coastline of Beleriand that flow into the Belegel Sea. They enter the sea from north to south in order of Bulisong River, Nengning River, and Xiruian River. There is also a river called the Galion River, which leaves Beleriand from the southern end of Beleriand, and flows into the sea somewhere south of the coastline of Middle-earth.

Of the four rivers, the first two have a short flow and originate from the plains of West Bereriand. The Bugsun River is twenty leagues long and at its mouth is the Sinda seaport city of Bulgunsongbar, and the Nenning River is forty leagues long and has another Sinda city of Eglarest at its mouth. The two cities are twenty-five leagues apart, and the area in between is ruled by the Pharaths, a branch of the Sindar elves. Their leader was Chirdan the shipbuilder.

Both of the above rivers are located in West Bereri Rand. And on the middle line of the entire Beleriander, the West Ryan River flows. It is the dividing line between East and West Beleurian and And. The river is also known as the Great River because of its flow into the sea and its widest width at its widest point is the largest in Beleriand. It originates from the Ejelsirien Springs in the north, flows south through the Serech Marshes, and continues down through the West Ryan Valley between the Eirid Wesling and the Kreisgreen peaks of the Shadow Mountains. In the valley lies a small island of Torsirian, on which sits the garrison of Taminas Tirith. Continuing south, the wadi that originates from the hidden road of Gondolin joins the West Ryan River. It then descends to the Bresil Ach crossing, which flows between the Bresil Forest and the Dinbar Plains until the Mindib River joins it. Next, in the area between the plains of Taras Dilnon and the forest of Doriath in the Sinda kingdom, the rivers Tegrin, Esgarduin, and Alos join the West Ryan River. Further south, the West Ryan River flows through the West Ryan Marsh, and the river that exits the swamp falls from the West Ryan Falls and into the ground. After five leagues of underground flow, it flows out of a cave known as the Gate of the Syrion. Twenty-five leagues later, through a willow forest, Nantasren. There, the Nalog River flows into the great river West Ryan, and then flows into the sea from the mouth of the West Ryan River. The length of the West Ryan River is one hundred and fifty leagues.

The river that runs through East Beleriande is the Galien River. It has a longer flow than the West Ryan River, but it is not as flowing and wide as the larger river. It has two origins, Simrin, where the eldest of the Fëanor's sons, Mezros, is garrisoned, and Mount, where the fourth brother, Calanhill, is garrisoned. The two headwaters, one large and one small, meet and merge into the Galien River. Forty leagues south, with no tributary coming in, the land called Shagailian, ruled by Caranhir, was on the east side of the Gaelian River. It was not until the southern edge of Shagailian that the first tributary, the Aska River, joined. The dwarven roads built by the dwarves were built along the Askar River. It then flows south into the Charros, Legolin, Brilthor, Duirvin and Abdulante rivers. These tributaries all originate from the Blue Mountains Eride Luin. The area where its six tributaries join the main stream is called Osirionde, the "Land of the Seven Rivers". The Seven Rivers refer to the Galians and its six tributaries. The part of it in the territory of Beleriand, which is also one hundred and fifty leagues long, leaves from the southern end of Beleriand.

Berry Ryan River System (-> indicates the inflow, if there are multiple tributaries, the number indicates the order of inflow):

Maotuin River - > Teeglin River

Chiron River - > Alos River

Gingeris River - > Narog River

(1) Wadi River, (2) Mindibu River, (3) Teeglin River, (4) Esgarduin River, (5) Alos River, (6) Narog River-> West Ryan River

(1) Aska River (2) Charos River (3) Legolin River (4) Brilthor River (5) Duirwin River (6) Abdulant River - > Galien River

(1) Bulrison River, (2) Nengning River, (3) West Ryan River, (4) Galien River-> Beregail Sea