The subject of this article originates from non-canonical sources. To find out about what is considered "canon" see LOTR:Canon.
Sîresha was a river located in the region of Sirayn. It ran 600 miles from its source in the Tûr Betark, in the mighty Káraskon Ravine, south of Ny Chennacatt, to its delta in the Bay of Ormal. The cities of Sirayn were founded along the Sîresha river and its tributaries.
Meltwater from two glaciers, as well as the torrential rains falling on the mountain peaks, feed its upper reaches to create a fastmoving current. The yellowish color of the water is due to the yellow sediment or loess eroded from the cliffs of the Tûr Betark. During Sadayn, the wettest season, a traveller following the foothills east from Ciryatandor must detour north to the Mára Gaib (“Bridge of the Old-settlers”) to cross the flood-swollen Sîresha. This remarkable engineering feat bridges the river at the narrowest point between Tartaust and Baud Selen.
Dropping through the Skara Riskál (“Wraith’s Teeth Rapids”), the river is joined at Tartaust by a small tributary and broadens to sweep smoothly along the bottom of a wide gorge. The current passes rapidly through chasms carved from mesas and rock outcroppings as well as across the vast plains of the scrubland typical of Chennacatt. Just above Rask, before the Maudar adds its flow to the Sîresha, the river drops in the Skara Sársus (“Cougar’s Gullet Rapids”), the last of the white water that makes the upper half of the Sîresha unnavigable.
The lower Sîresha is a tamer stream, flowing between low banks and meandering in ever greater loops as it approaches the Bay of Ormal. It shrugs once more at the ruins of Charnesra, where unusal rock formations in the river create lethal undercurrents and an obstructed channel for water traffic. Young and daring adventurers sometimes brave the swirling current, but more prudent travellers and commercial bargemasters still use the old canal through the ruins to avoid the possibility of sinking their vessels.
The great forest bordering Isra, the Sára Bask, grows right up to the river, its scrubby undergrowth and hardy trees overhanging the southern bank. Torbusaud (“Greenbarks”), slow barges of herb pickers, patrol this section of the Sîresha to allow workers to efficiently harvest the wood’s bounty while still afloat. The lazy Sîrsis river flows between trunks of the famous bausk trees (known for their bizarely corkscrewed limbs) of the forest to join the Sîresha. The combined currents dump into the Mard Isauba, a finger of the greater Bay of Ormal, at Tûl Harar.