Harnen

In J. R. R. Tolkien's fictional universe of Middle-earth, the river Harnen (Southing) was a river south of Gondor.

It formed the southern border of the contested land of Harondor, South Gondor, and as such formed the southern border of Dúnedain influence. South of the Harnen lay the land of Near Harad.

A good 600 Númenórean miles long, it began in the Ephel Dúath of Mordor and then flowed sout-west for about 350 miles, when it bent west and sped to Belegaer, which it entered in a wide delta. The Great South Road into Harad crossed the Harnen shortly after it bent westwards. This road was used by Sauron's followers later in the Third Age.